/// next_move() is the most important method of the MovePicker class. It returns
/// a new pseudo legal move every time it is called, until there are no more moves
/// left. It picks the move with the biggest value from a list of generated moves
/// taking care not to return the ttMove if it has already been searched.
public Move next_move_false()
{
Move move;
while (true)
{
while (cur == end)
{
generate_next_stage();
}
switch (stage)
{
case StagesS.MAIN_SEARCH:
case StagesS.EVASION:
case StagesS.QSEARCH_0:
case StagesS.QSEARCH_1:
case StagesS.PROBCUT:
++cur;
return(ttMove);
case StagesS.CAPTURES_S1:
move = moves[pick_best(moves, cur++, end)].move;
if (move != ttMove)
{
if (pos.see_sign(move) >= ValueS.VALUE_ZERO)
{
return(move);
}
// Losing capture, move it to the tail of the array
moves[endBadCaptures--].move = move;
}
break;
case StagesS.KILLERS_S1:
move = moves[cur++].move;
if (move != MoveS.MOVE_NONE &&
move != ttMove &&
pos.pseudo_legal(move) &&
!pos.capture(move))
{
return(move);
}
break;
case StagesS.QUIETS_1_S1:
case StagesS.QUIETS_2_S1:
move = moves[cur++].move;
if (move != ttMove &&
move != moves[Types.MAX_MOVES].move &&
move != moves[Types.MAX_MOVES + 1].move &&
move != moves[Types.MAX_MOVES + 2].move &&
move != moves[Types.MAX_MOVES + 3].move &&
move != moves[Types.MAX_MOVES + 4].move &&
move != moves[Types.MAX_MOVES + 5].move)
{
return(move);
}
break;
case StagesS.BAD_CAPTURES_S1:
return(moves[cur--].move);
case StagesS.EVASIONS_S2:
case StagesS.CAPTURES_S3:
case StagesS.CAPTURES_S4:
move = moves[pick_best(moves, cur++, end)].move;
if (move != ttMove)
{
return(move);
}
break;
case StagesS.CAPTURES_S5:
move = moves[pick_best(moves, cur++, end)].move;
if (move != ttMove && pos.see(move) > captureThreshold)
{
return(move);
}
break;
case StagesS.CAPTURES_S6:
move = moves[pick_best(moves, cur++, end)].move;
if (Types.to_sq(move) == recaptureSquare)
{
return(move);
}
break;
case StagesS.QUIET_CHECKS_S3:
move = moves[cur++].move;
if (move != ttMove)
{
return(move);
}
break;
case StagesS.STOP:
return(MoveS.MOVE_NONE);
default:
Debug.Assert(false);
break;
}
}
}
