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board.cpp
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/*
* Classes
* - Board: represents a game state
* - EvalScheme: evaluation scheme
*
* (c) 1997-2005, Josef Weidendorfer
*/
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include "search.h"
#include "board.h"
#if 0
#include <assert.h>
#define CHECK(b) assert(b)
#else
#define CHECK(b)
#endif
/// MoveCounter
MoveCounter::MoveCounter()
{
init();
}
void MoveCounter::init()
{
for(int i=0;i < Move::typeCount;i++)
_moveCount[i] = 0;
for(int i=0;i < inARowCount;i++)
_rowCount[i] = 0;
}
int MoveCounter::moveSum()
{
int sum = _moveCount[0];
for(int i=1;i < Move::typeCount;i++)
sum += _moveCount[i];
return sum;
}
/****************************** Class Board ****************************/
/* Board for start of a game */
int Board::startBoard[]={
10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10,
10, 1, 1, 1, 1, 1, 10, 10, 10, 10, 10,
10, 1, 1, 1, 1, 1, 1, 10, 10, 10, 10,
10, 0, 0, 1, 1, 1, 0, 0, 10, 10, 10,
10, 0, 0, 0, 0, 0, 0, 0, 0, 10, 10,
10, 0, 0, 0, 0, 0, 0, 0, 0, 0, 10,
10, 10, 0, 0, 0, 0, 0, 0, 0, 0, 10,
10, 10, 10, 0, 0, 2, 2, 2, 0, 0, 10,
10, 10, 10, 10, 2, 2, 2, 2, 2, 2, 10,
10, 10, 10, 10, 10, 2, 2, 2, 2, 2, 10,
10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10 };
/* first centrum of board, then rings around (numbers are indexes) */
int Board::order[]={
60,
61,72,71,59,48,49,
62,73,84,83,82,70,58,47,36,37,38,50,
63,74,85,96,95,94,93,81,69,57,46,35,24,25,26,27,39,51,
64,75,86,97,108,107,106,105,104,92,80,68,56,45,34,23,12,
13,14,15,16,28,40,52 };
int Board::direction[]= { -11,1,12,11,-1,-12,-11,1 };
Board::Board()
{
clear();
_verbose = 0;
_ev = 0;
}
void Board::begin(int startColor)
{
int i;
for(i=0;i<AllFields;i++)
field[i] = startBoard[i];
storedFirst = storedLast = 0;
color = startColor;
color1Count = color2Count = 14;
_msecsToPlay[color1] = _msecsToPlay[color2] = 0;
::srand(0); // Initialize random sequence
}
void Board::clear()
{
int i;
for(i=0;i<AllFields;i++)
field[i] = (startBoard[i] == out) ? out: free;
storedFirst = storedLast = 0;
color1Count = color2Count = 0;
_msecsToPlay[color1] = _msecsToPlay[color2] = 0;
}
/** countFrom
*
* Used for board evaluation to count allowed move types and
* connectiveness. VERY similar to move generation.
*/
void Board::countFrom(int startField, int color,
MoveCounter& MCounter)
{
int d, dir, c, actField, c2;
bool left, right;
/* 6 directions */
for(d=1;d<7;d++) {
dir = fieldDiffOfDir(d);
/* 2nd field */
c = field[actField = startField+dir];
if (c == free) {
MCounter.incType( Move::move1 );
continue;
}
if (c != color)
continue;
/* 2nd == color */
MCounter.incRow( MoveCounter::inARow2 );
/* left side move 2 */
left = (field[startField + fieldDiffOfDir(d-1)] == free);
if (left) {
left = (field[actField + fieldDiffOfDir(d-1)] == free);
if (left)
MCounter.incType( Move::left2 );
}
/* right side move 2 */
right = (field[startField + fieldDiffOfDir(d+1)] == free);
if (right) {
right = (field[actField + fieldDiffOfDir(d+1)] == free);
if (right)
MCounter.incType( Move::right2 );
}
/* 3rd field */
c = field[actField += dir];
if (c == free) {
/* (c c .) */
MCounter.incType( Move::move2 );
continue;
}
else if (c == out) {
continue;
}
else if (c != color) {
/* 4th field */
c = field[actField += dir];
if (c == free) {
/* (c c o .) */
MCounter.incType( Move::push1with2 );
}
else if (c == out) {
/* (c c o |) */
MCounter.incType( Move::out1with2 );
}
continue;
}
/* 3nd == color */
MCounter.incRow( MoveCounter::inARow3 );
/* left side move 3 */
if (left) {
left = (field[actField + fieldDiffOfDir(d-1)] == free);
if (left)
MCounter.incType( Move::left3 );
}
/* right side move 3 */
if (right) {
right = (field[actField + fieldDiffOfDir(d+1)] == free);
if (right)
MCounter.incType( Move::right3 );
}
/* 4th field */
c = field[actField += dir];
if (c == free) {
/* (c c c .) */
MCounter.incType( Move::move3 );
continue;
}
else if (c == out) {
continue;
}
else if (c != color) {
/* 4nd == opponent */
/* 5. field */
c2 = field[actField += dir];
if (c2 == free) {
/* (c c c o .) */
MCounter.incType( Move::push1with3 );
continue;
}
else if (c2 == out) {
/* (c c c o |) */
MCounter.incType( Move::out1with3 );
continue;
}
if (c2 != c)
continue;
/* 5nd == opponent */
/* 6. field */
c2 = field[actField += dir];
if (c2 == free) {
/* (c c c o o .) */
MCounter.incType( Move::push2 );
}
else if (c2 == out) {
/* (c c c o o |) */
MCounter.incType( Move::out2 );
}
continue;
}
/* 4nd == color */
MCounter.incRow( MoveCounter::inARow4 );
/* 5th field */
c = field[actField += dir];
if (c != color)
continue;
/* 4nd == color */
MCounter.incRow( MoveCounter::inARow5 );
}
}
/* generate moves starting at field <startField> */
void Board::generateFieldMoves(int startField, MoveList& list)
{
int d, dir, c, actField;
bool left, right;
int opponent = (color == color1) ? color2 : color1;
assert( field[startField] == color );
/* 6 directions */
for(d=1;d<7;d++) {
dir = direction[d];
/* 2nd field */
c = field[actField = startField+dir];
if (c == free) {
/* (c .) */
list.insert(startField, d, Move::move1);
continue;
}
if (c != color)
continue;
/* 2nd == color */
left = (field[startField+direction[d-1]] == free);
if (left) {
left = (field[actField+direction[d-1]] == free);
if (left)
/* 2 left */
list.insert(startField, d, Move::left2);
}
right = (field[startField+direction[d+1]] == free);
if (right) {
right = (field[actField+direction[d+1]] == free);
if (right)
/* 2 right */
list.insert(startField, d, Move::right2);
}
/* 3rd field */
c = field[actField += dir];
if (c == free) {
/* (c c .) */
list.insert(startField, d, Move::move2);
continue;
}
else if (c == opponent) {
/* 4th field */
c = field[actField += dir];
if (c == free) {
/* (c c o .) */
list.insert(startField, d, Move::push1with2);
}
else if (c == out) {
/* (c c o |) */
list.insert(startField, d, Move::out1with2);
}
continue;
}
if (c != color)
continue;
/* 3nd == color */
if (left) {
if (field[actField+direction[d-1]] == free)
/* 3 left */
list.insert(startField, d, Move::left3);
}
if (right) {
if (field[actField+direction[d+1]] == free)
/* 3 right */
list.insert(startField, d, Move::right3);
}
/* 4th field */
c = field[actField += dir];
if (c == free) {
/* (c c c .) */
list.insert(startField, d, Move::move3);
continue;
}
if (c != opponent)
continue;
/* 4nd == opponent */
/* 5. field */
c = field[actField += dir];
if (c == free) {
/* (c c c o .) */
list.insert(startField, d, Move::push1with3);
continue;
}
else if (c == out) {
/* (c c c o |) */
list.insert(startField, d, Move::out1with3);
continue;
}
if (c != opponent)
continue;
/* 5nd == opponent */
/* 6. field */
c = field[actField += dir];
if (c == free) {
/* (c c c o o .) */
list.insert(startField, d, Move::push2);
}
else if (c == out) {
/* (c c c o o |) */
list.insert(startField, d, Move::out2);
}
}
}
void Board::generateMoves(MoveList& list)
{
int actField, f;
for(f=0;f<RealFields;f++) {
actField = order[f];
if ( field[actField] == color)
generateFieldMoves(actField, list);
}
}
Move Board::moveToReach(Board* b, bool fuzzy)
{
Move m;
/* can not move from invalid position */
int state = validState();
if ((state != valid1) && (state != valid2))
return m;
if (!fuzzy) {
if (b->moveNo() != _moveNo+1) {
if (_verbose)
printf("Board::moveToReach: moveNo %d => %d ?!\n",
_moveNo, b->moveNo());
return m;
}
/* only time left for player can have decreased */
int opponent = (color == color1) ? color2 : color1;
if (_msecsToPlay[opponent] != b->msecsToPlay(opponent)) {
if (_verbose)
printf("Board::moveToReach: Opponent time changed ?!\n");
return m;
}
if (_msecsToPlay[color] < b->msecsToPlay(color)) {
if (_verbose)
printf("Board::moveToReach: Player time increased ?!\n");
return m;
}
}
/* detect move drawn */
MoveList l;
generateMoves(l);
if (_verbose) {
printf("Board::moveToReach - %d allowed moves:\n",
l.getLength());
Move found;
int type = Move::none;
while(l.getNext(m, Move::maxMoveType)) {
playMove(m);
bool isSame = hasSameFields(b);
takeBack();
if (isSame) found = m;
if (m.type != type) {
type = m.type;
printf(" %s:\n", m.typeName());
}
printf(" %s%s\n", m.name(), isSame ? " <== Choosen":"");
}
m = found;
}
else {
while(l.getNext(m, Move::maxMoveType)) {
playMove(m);
bool isSame = hasSameFields(b);
takeBack();
if (isSame) break;
}
}
return m;
}
bool Board::hasSameFields(Board* b)
{
int f, actField;
for(f=0;f<RealFields;f++) {
actField = order[f];
if ( field[actField] != (*b)[actField] )
return false;
}
return true;
}
void Board::playMove(const Move& m, int msecs)
{
int f, dir, dir2;
int opponent = (color == color1) ? color2:color1;
CHECK( isConsistent() );
if (++storedLast == MvsStored) storedLast = 0;
/* Buffer full -> delete oldest entry */
if (storedLast == storedFirst)
if (++storedFirst == MvsStored) storedFirst = 0;
storedMove[storedLast] = m;
f = m.field;
CHECK( (m.type >= 0) && (m.type < Move::none));
CHECK( field[f] == color );
field[f] = free;
dir = direction[m.direction];
switch(m.type) {
case Move::out2: /* (c c c o o |) */
CHECK( field[f + dir] == color );
CHECK( field[f + 2*dir] == color );
CHECK( field[f + 3*dir] == opponent );
CHECK( field[f + 4*dir] == opponent );
CHECK( field[f + 5*dir] == out );
field[f + 3*dir] = color;
break;
case Move::out1with3: /* (c c c o |) */
CHECK( field[f + dir] == color );
CHECK( field[f + 2*dir] == color );
CHECK( field[f + 3*dir] == opponent );
CHECK( field[f + 4*dir] == out );
field[f + 3*dir] = color;
break;
case Move::move3: /* (c c c .) */
CHECK( field[f + dir] == color );
CHECK( field[f + 2*dir] == color );
CHECK( field[f + 3*dir] == free );
field[f + 3*dir] = color;
break;
case Move::out1with2: /* (c c o |) */
CHECK( field[f + dir] == color );
CHECK( field[f + 2*dir] == opponent );
CHECK( field[f + 3*dir] == out );
field[f + 2*dir] = color;
break;
case Move::move2: /* (c c .) */
CHECK( field[f + dir] == color );
CHECK( field[f + 2*dir] == free );
field[f + 2*dir] = color;
break;
case Move::push2: /* (c c c o o .) */
CHECK( field[f + dir] == color );
CHECK( field[f + 2*dir] == color );
CHECK( field[f + 3*dir] == opponent );
CHECK( field[f + 4*dir] == opponent );
CHECK( field[f + 5*dir] == free );
field[f + 3*dir] = color;
field[f + 5*dir] = opponent;
break;
case Move::left3:
dir2 = direction[m.direction-1];
CHECK( field[f + dir] == color );
CHECK( field[f + 2*dir] == color );
CHECK( field[f + dir2] == free );
CHECK( field[f + dir+dir2] == free );
CHECK( field[f + 2*dir+dir2] == free );
field[f+dir2] = color;
field[f+=dir] = free;
field[f+dir2] = color;
field[f+=dir] = free;
field[f+dir2] = color;
break;
case Move::right3:
dir2 = direction[m.direction+1];
CHECK( field[f + dir] == color );
CHECK( field[f + 2*dir] == color );
CHECK( field[f + dir2] == free );
CHECK( field[f + dir+dir2] == free );
CHECK( field[f + 2*dir+dir2] == free );
field[f+dir2] = color;
field[f+=dir] = free;
field[f+dir2] = color;
field[f+=dir] = free;
field[f+dir2] = color;
break;
case Move::push1with3: /* (c c c o .) => (. c c c o) */
CHECK( field[f + dir] == color );
CHECK( field[f + 2*dir] == color );
CHECK( field[f + 3*dir] == opponent );
CHECK( field[f + 4*dir] == free );
field[f + 3*dir] = color;
field[f + 4*dir] = opponent;
break;
case Move::push1with2: /* (c c o .) => (. c c o) */
CHECK( field[f + dir] == color );
CHECK( field[f + 2*dir] == opponent );
CHECK( field[f + 3*dir] == free );
field[f + 2*dir] = color;
field[f + 3*dir] = opponent;
break;
case Move::left2:
dir2 = direction[m.direction-1];
CHECK( field[f + dir] == color );
CHECK( field[f + dir2] == free );
CHECK( field[f + dir+dir2] == free );
field[f+dir2] = color;
field[f+=dir] = free;
field[f+dir2] = color;
break;
case Move::right2:
dir2 = direction[m.direction+1];
CHECK( field[f + dir] == color );
CHECK( field[f + dir2] == free );
CHECK( field[f + dir+dir2] == free );
field[f+dir2] = color;
field[f+=dir] = free;
field[f+dir2] = color;
break;
case Move::move1: /* (c .) => (. c) */
CHECK( field[f + dir] == free );
field[f + dir] = color;
break;
default:
break;
}
if (m.isOutMove()) {
if (color == color1)
color2Count--;
else
color1Count--;
}
/* adjust move number and time */
_moveNo++;
if ((_msecsToPlay[color]>0) && (msecs>0)) {
if (_msecsToPlay[color] > msecs)
_msecsToPlay[color] -= msecs;
else
_msecsToPlay[color] = 0;
}
/* change actual color */
color = opponent;
CHECK( isConsistent() );
}
bool Board::takeBack()
{
int f, dir, dir2;
int opponent = color;
Move& m = storedMove[storedLast];
CHECK( isConsistent() );
if (storedFirst == storedLast) return false;
/* change actual color */
color = (color == color1) ? color2:color1;
if (m.isOutMove()) {
if (color == color1)
color2Count++;
else
color1Count++;
}
f = m.field;
CHECK( field[f] == free );
field[f] = color;
dir = direction[m.direction];
switch(m.type) {
case Move::out2: /* (. c c c o |) => (c c c o o |) */
CHECK( field[f + dir] == color );
CHECK( field[f + 2*dir] == color );
CHECK( field[f + 3*dir] == color );
CHECK( field[f + 4*dir] == opponent );
CHECK( field[f + 5*dir] == out );
field[f + 3*dir] = opponent;
break;
case Move::out1with3: /* (. c c c |) => (c c c o |) */
CHECK( field[f + dir] == color );
CHECK( field[f + 2*dir] == color );
CHECK( field[f + 3*dir] == color );
CHECK( field[f + 4*dir] == out );
field[f + 3*dir] = opponent;
break;
case Move::move3: /* (. c c c) => (c c c .) */
CHECK( field[f + dir] == color );
CHECK( field[f + 2*dir] == color );
CHECK( field[f + 3*dir] == color );
field[f + 3*dir] = free;
break;
case Move::out1with2: /* (. c c | ) => (c c o |) */
CHECK( field[f + dir] == color );
CHECK( field[f + 2*dir] == color );
CHECK( field[f + 3*dir] == out );
field[f + 2*dir] = opponent;
break;
case Move::move2: /* (. c c) => (c c .) */
CHECK( field[f + dir] == color );
CHECK( field[f + 2*dir] == color );
field[f + 2*dir] = free;
break;
case Move::push2: /* (. c c c o o) => (c c c o o .) */
CHECK( field[f + dir] == color );
CHECK( field[f + 2*dir] == color );
CHECK( field[f + 3*dir] == color );
CHECK( field[f + 4*dir] == opponent );
CHECK( field[f + 5*dir] == opponent );
field[f + 3*dir] = opponent;
field[f + 5*dir] = free;
break;
case Move::left3:
dir2 = direction[m.direction-1];
CHECK( field[f + dir] == free );
CHECK( field[f + 2*dir] == free );
CHECK( field[f + dir2] == color );
CHECK( field[f + dir+dir2] == color );
CHECK( field[f + 2*dir+dir2] == color );
field[f+dir2] = free;
field[f+=dir] = color;
field[f+dir2] = free;
field[f+=dir] = color;
field[f+dir2] = free;
break;
case Move::right3:
dir2 = direction[m.direction+1];
CHECK( field[f + dir] == free );
CHECK( field[f + 2*dir] == free );
CHECK( field[f + dir2] == color );
CHECK( field[f + dir+dir2] == color );
CHECK( field[f + 2*dir+dir2] == color );
field[f+dir2] = free;
field[f+=dir] = color;
field[f+dir2] = free;
field[f+=dir] = color;
field[f+dir2] = free;
break;
case Move::push1with3: /* (. c c c o) => (c c c o .) */
CHECK( field[f + dir] == color );
CHECK( field[f + 2*dir] == color );
CHECK( field[f + 3*dir] == color );
CHECK( field[f + 4*dir] == opponent );
field[f + 3*dir] = opponent;
field[f + 4*dir] = free;
break;
case Move::push1with2: /* (. c c o) => (c c o .) */
CHECK( field[f + dir] == color );
CHECK( field[f + 2*dir] == color );
CHECK( field[f + 3*dir] == opponent );
field[f + 2*dir] = opponent;
field[f + 3*dir] = free;
break;
case Move::left2:
dir2 = direction[m.direction-1];
CHECK( field[f + dir] == free );
CHECK( field[f + dir2] == color );
CHECK( field[f + dir+dir2] == color );
field[f+dir2] = free;
field[f+=dir] = color;
field[f+dir2] = free;
break;
case Move::right2:
dir2 = direction[m.direction+1];
CHECK( field[f + dir] == free );
CHECK( field[f + dir2] == color );
CHECK( field[f + dir+dir2] == color );
field[f+dir2] = free;
field[f+=dir] = color;
field[f+dir2] = free;
break;
case Move::move1: /* (. c) => (c .) */
CHECK( field[f + dir] == color );
field[f + dir] = free;
break;
default:
break;
}
if (--storedLast < 0) storedLast = MvsStored-1;
/* adjust move number. Time is intentionally not reset */
_moveNo--;
CHECK( isConsistent() );
return true;
}
int Board::movesStored()
{
int c = storedLast - storedFirst;
if (c<0) c+= MvsStored;
return c;
}
/** validState
*
* Check for a valid board position to play from:
* (1) Number of balls for each color has to be between 9 and 14
* (2) There must be a move possible for actual color
*/
int Board::validState()
{
MoveCounter mc;
int c1 = 0, c2 = 0;
int i,j, moveCount, res;
int color = actColor();
for(i=0;i<AllFields;i++) {
j=field[i];
if (j == color1) c1++;
if (j == color2) c2++;
if (j == color)
countFrom( i, color, mc);
}
color1Count = c1;
color2Count = c2;
moveCount = mc.moveSum();
if (c1==0 && c2==0)
res = empty;
// impossible token counts
else if (c1>14 || c2>14 || (c1<9 && c2<9))
res = invalid;
else if (c1<9)
res = win2;
else if (c2<9)
res = win1;
// counts are in valid range...
else if (moveCount>0) {
if (color == color1) {
if (_msecsToPlay[color1]>0 && _msecsToPlay[color2]<=0)
res = timeout2;
else
res = valid1;
}
else {
if (_msecsToPlay[color2]>0 && _msecsToPlay[color1]<=0)
res = timeout1;
else
res = valid2;
}
}
// color which has to draw can not do any move... win for opponent!
else if (color == color1)
res = win2;
else
res = win1;
#ifdef MYTRACE
if (spyLevel>2) {
indent(spyDepth);
printf("Valid: %s (Color1 %d, Color2 %d, moveCount of %d: %d)\n",
(res == empty) ? "empty" : (res==valid) ? "valid":"invalid",
c1,c2,color,moveCount);
}
#endif
return res;
}
const char* Board::stateDescription(int s)
{
switch(s) {
case empty: return "Empty board";
case invalid: return "Invalid board";
case valid1: return "O about to move...";
case valid2: return "X about to move...";
case timeout1: return "O timed out. X wins!";
case timeout2: return "X timed out. O wins!";
case win1: return "O wins the game!";
case win2: return "X wins the game!";
default: break;
}
return "Unknown state?";
}
bool Board::isConsistent()
{
int c1 = 0, c2 = 0;
int i,j;
for(i=0;i<RealFields;i++) {
j=field[order[i]];
if (j == color1) c1++;
if (j == color2) c2++;
}
return (color1Count == c1 && color2Count == c2);
}
void Board::setSearchStrategy(SearchStrategy* ss)
{
_ss = ss;
}
void Board::setDepth(int d)
{
if (!_ss) return;
_ss->setMaxDepth(d+1);
}
int Board::getMaximumDepth()
{
// if (!_ss) return;
return (_ss->getMaxDepth());
}
Move& Board::bestMove()
{
static Move best;
best = _ss->bestMove(this);
return best;
}
Move& Board::nextMove()
{
return _ss->nextMove();
}
void Board::stopSearch()
{
_ss->stopSearch();
}
Move Board::randomMove()
{
Move m;
MoveList list;
generateMoves(list);
int l = list.getLength();
int j = (::rand() % l) +1;
while(j != 0) {
list.getNext(m, Move::none);
j--;
}
return m;
}
void Board::print()
{
printf( "%s", getState() );
}
char* Board::getShortState()
{
static char b[256];
int pos = 0;
pos += sprintf(b+pos, "#%d %c - ",
_moveNo, (color == 1) ? 'O':'X');
pos += sprintf(b+pos, "O: %d", color1Count);
if (_msecsToPlay[color1]>0)
pos += sprintf(b+pos, " (%d.%03d s)",
_msecsToPlay[color1]/1000, _msecsToPlay[color1]%1000);
pos += sprintf(b+pos, ", X: %d", color2Count);
if (_msecsToPlay[color2]>0)
pos += sprintf(b+pos, " (%d.%03d s)",
_msecsToPlay[color2]/1000, _msecsToPlay[color2]%1000);
return b;
}
/* Returns a human readable board representation.
* The returned string will be overwritten in later calls.
*/
char* Board::getState()
{
static char b[1024];
int pos = 0;
int row,i;
char spaces[]=" ";
const char *z[]={". ","O ","X ", "o ", "x "};
pos = sprintf(b, "\n");
if (_moveNo>=0)
pos += sprintf(b+pos, "%s\n", getShortState());
pos += sprintf(b+pos, " -----------\n");
for(row=0;row<4;row++) {
pos += sprintf(b+pos, "%s/ ",spaces+row);
for(i=0;i<5+row;i++)
pos += sprintf(b+pos, "%s",z[field[row*11+12+i]]);
pos += sprintf(b+pos, "\\\n");
}
pos += sprintf(b+pos, " | ");
for(i=0;i<9;i++)
pos += sprintf(b+pos, "%s", z[field[56+i]]);
pos += sprintf(b+pos, "|\n");
for(row=0;row<4;row++) {
pos += sprintf(b+pos, "%s\\ ",spaces+3-row);
for(i=0;i<8-row;i++)
pos += sprintf(b+pos, "%s",z[field[68+row*12+i]]);
pos += sprintf(b+pos, "/\n");
}
pos += sprintf(b+pos, " -----------\n");
return b;
}
bool Board::setState(char* s)
{