break;
case PH_BAD_CAPTURES:
- badCapturesPicked = 0;
+ movesPicked = 0;
break;
case PH_NONCAPTURES:
case PH_EVASIONS:
assert(pos.is_check());
- numOfMoves = generate_evasions(pos, moves);
+ numOfMoves = generate_evasions(pos, moves, pinned);
score_evasions();
movesPicked = 0;
break;
// to the badCaptures[] array.
Move m;
int seeValue;
- Square from, to;
for (int i = 0; i < numOfMoves; i++)
{
m = moves[i].move;
- from = move_from(m);
- to = move_to(m);
-
- bool hxl = ( int(pos.midgame_value_of_piece_on(from))
- -int(pos.midgame_value_of_piece_on(to)) > 0)
- || pos.type_of_piece_on(from) == KING;
-
- // Avoid calling see() for LxH and equal captures because
- // SEE is always >= 0 and we order for MVV/LVA anyway.
- seeValue = (hxl ? pos.see(m) : 0);
-
+ seeValue = pos.see(m);
if (seeValue >= 0)
{
if (move_promotion(m))
moves[i].score = QueenValueMidgame;
else
- moves[i].score = int(pos.midgame_value_of_piece_on(to))
- -int(pos.type_of_piece_on(from));
+ moves[i].score = int(pos.midgame_value_of_piece_on(move_to(m)))
+ -int(pos.type_of_piece_on(move_from(m)));
}
else
{
}
-/// find_best_index() loops across the moves and returns index of\r
-/// the highest scored one. There is also a second version that\r
-/// lowers the priority of moves that attack the same square,\r
-/// so that if the best move that attack a square fails the next\r
+/// find_best_index() loops across the moves and returns index of
+/// the highest scored one. There is also a second version that
+/// lowers the priority of moves that attack the same square,
+/// so that if the best move that attack a square fails the next
/// move picked attacks a different square if any, not the same one.
int MovePicker::find_best_index() {
- int bestScore = -10000000, bestIndex = -1;
+ assert(movesPicked < numOfMoves);
- for (int i = movesPicked; i < numOfMoves; i++)
+ int bestIndex = movesPicked, bestScore = moves[movesPicked].score;
+
+ for (int i = movesPicked + 1; i < numOfMoves; i++)
if (moves[i].score > bestScore)
{
bestIndex = i;
return bestIndex;
}
-int MovePicker::find_best_index(Bitboard* squares, int values[]) {\r
-\r
- int hs;\r
- Move m;\r
- Square to;\r
- int bestScore = -10000000, bestIndex = -1;\r
-\r
- for (int i = movesPicked; i < numOfMoves; i++)\r
- {\r
- m = moves[i].move;\r
- to = move_to(m);\r
- \r
- if (!bit_is_set(*squares, to))\r
- {\r
- // Init at first use\r
- set_bit(squares, to);\r
- values[to] = 0;\r
- }\r
-\r
- hs = moves[i].score - values[to];\r
- if (hs > bestScore)\r
- {\r
- bestIndex = i;\r
- bestScore = hs;\r
- }\r
- }\r
-\r
- if (bestIndex != -1)\r
- {\r
- // Raise value of the picked square, so next attack\r
- // to the same square will get low priority.\r
- to = move_to(moves[bestIndex].move);\r
- values[to] += 0xB00;\r
- }\r
- return bestIndex;\r
+int MovePicker::find_best_index(Bitboard* squares, int values[]) {
+
+ assert(movesPicked < numOfMoves);
+
+ int hs;
+ Move m;
+ Square to;
+ int bestScore = -10000000, bestIndex = -1;
+
+ for (int i = movesPicked; i < numOfMoves; i++)
+ {
+ m = moves[i].move;
+ to = move_to(m);
+
+ if (!bit_is_set(*squares, to))
+ {
+ // Init at first use
+ set_bit(squares, to);
+ values[to] = 0;
+ }
+
+ hs = moves[i].score - values[to];
+ if (hs > bestScore)
+ {
+ bestIndex = i;
+ bestScore = hs;
+ }
+ }
+
+ if (bestIndex != -1)
+ {
+ // Raise value of the picked square, so next attack
+ // to the same square will get low priority.
+ to = move_to(moves[bestIndex].move);
+ values[to] += 0xB00;
+ }
+ return bestIndex;
}
Move move;
switch (PhaseTable[phaseIndex]) {
+
case PH_GOOD_CAPTURES:
assert(!pos.is_check());
assert(movesPicked >= 0);
while (movesPicked < numOfMoves)
{
bestIndex = find_best_index();
-
- if (bestIndex != -1) // Found a good capture
- {
- move = moves[bestIndex].move;
- moves[bestIndex] = moves[movesPicked++];
- if ( move != ttMove
- && move != mateKiller
- && pos.pl_move_is_legal(move, pinned))
- return move;
- }
+ move = moves[bestIndex].move;
+ moves[bestIndex] = moves[movesPicked++];
+ if ( move != ttMove
+ && move != mateKiller
+ && pos.pl_move_is_legal(move, pinned))
+ return move;
}
break;
// been searched and it is not a PV node, we are probably failing low
// anyway, so we just pick the first move from the list.
bestIndex = (pvNode || movesPicked < 12) ? find_best_index() : movesPicked;
-
- if (bestIndex != -1)
- {
- move = moves[bestIndex].move;
- moves[bestIndex] = moves[movesPicked++];
- if ( move != ttMove
- && move != mateKiller
- && pos.pl_move_is_legal(move, pinned))
- return move;
- }
+ move = moves[bestIndex].move;
+ moves[bestIndex] = moves[movesPicked++];
+ if ( move != ttMove
+ && move != mateKiller
+ && pos.pl_move_is_legal(move, pinned))
+ return move;
}
break;
while (movesPicked < numOfMoves)
{
bestIndex = find_best_index();
-
- if (bestIndex != -1)
- {
- move = moves[bestIndex].move;
- moves[bestIndex] = moves[movesPicked++];
- return move;
- }
+ move = moves[bestIndex].move;
+ moves[bestIndex] = moves[movesPicked++];
+ return move;
}
break;
case PH_BAD_CAPTURES:
assert(!pos.is_check());
- assert(badCapturesPicked >= 0);
+ assert(movesPicked >= 0);
// It's probably a good idea to use SEE move ordering here, instead
// of just picking the first move. FIXME
- while (badCapturesPicked < numOfBadCaptures)
+ while (movesPicked < numOfBadCaptures)
{
- move = badCaptures[badCapturesPicked++].move;
+ move = badCaptures[movesPicked++].move;
if ( move != ttMove
&& move != mateKiller
&& pos.pl_move_is_legal(move, pinned))
while (movesPicked < numOfMoves)
{
bestIndex = (movesPicked < 4 ? find_best_index() : movesPicked);
-
- if (bestIndex != -1)
- {
- move = moves[bestIndex].move;
- moves[bestIndex] = moves[movesPicked++];
- // Remember to change the line below if we decide to hash the qsearch!
- // Maybe also postpone the legality check until after futility pruning?
- if (/* move != ttMove && */ pos.pl_move_is_legal(move, pinned))
- return move;
- }
+ move = moves[bestIndex].move;
+ moves[bestIndex] = moves[movesPicked++];
+ // Remember to change the line below if we decide to hash the qsearch!
+ // Maybe also postpone the legality check until after futility pruning?
+ if (/* move != ttMove && */ pos.pl_move_is_legal(move, pinned))
+ return move;
}
break;