func (b *TBoard) EvalCol(c piece.TColor) int {
eval := b.Material[IndexOfColor(c)]
ksq := b.GetKingPos(c)
ksqr := int(square.BOARD_HEIGHTL - square.RankOf(ksq))
eval += ksqr * KING_ADVANCE_VALUE
return eval
}
func InitMoveTable() {
ptr := 0
for _, pt := range ALL_PIECE_TYPES {
for sq := 0; sq < square.BOARD_SIZE; sq++ {
MoveTablePtrs[TMoveTableKey{square.TSquare(sq), piece.FromTypeAndColor(piece.TPieceType(pt), piece.BLACK)}] = ptr
MoveTablePtrs[TMoveTableKey{square.TSquare(sq), piece.FromTypeAndColor(piece.TPieceType(pt), piece.WHITE)}] = ptr
for df := -2; df <= 2; df++ {
for dr := -2; dr <= 2; dr++ {
vector_ok := false
dfabs := math.Abs(float64(df))
drabs := math.Abs(float64(dr))
prodabs := dfabs * drabs
sumabs := dfabs + drabs
if (pt & piece.IS_JUMPING) != 0 {
vector_ok = vector_ok || (prodabs == 2)
}
if (pt & piece.IS_STRAIGHT) != 0 {
vector_ok = vector_ok || (sumabs == 1)
}
if (pt & piece.IS_DIAGONAL) != 0 {
vector_ok = vector_ok || (prodabs == 1)
}
if vector_ok {
ok := true
f := int(square.FileOf(square.TSquare(sq)))
r := int(square.RankOf(square.TSquare(sq)))
vector_start := ptr
for ok {
f += df
r += dr
if square.FileRankOk(f, r) {
tsq := square.FromFileRank(square.TFile(f), square.TRank(r))
MoveTable[ptr].To = tsq
MoveTable[ptr].EndPiece = false
ptr++
} else {
ok = false
}
if (pt & piece.IS_SLIDING) == 0 {
ok = false
}
}
for vector_next_ptr := vector_start; vector_next_ptr < ptr; vector_next_ptr++ {
MoveTable[vector_next_ptr].NextVector = ptr
}
}
}
}
MoveTable[ptr].EndPiece = true
ptr++
}
}
}
func (b *TBoard) NextLegalMove() bool {
if b.BlackKingOnBaseRank() {
return false
}
wb := b.WhiteKingOnBaseRank()
if wb && b.IsWhiteTurn() {
return false
}
if b.HasBestMove {
if !b.BestMoveDone {
b.CurrentMove = b.BestMove
b.BestMoveDone = true
return true
}
}
for b.NextPseudoLegalMove() {
b.MakeMove(b.CurrentMove)
incheck := b.IsInCheck()
oppincheck := b.IsOppInCheck()
blackmated := (wb && (!b.BlackKingOnBaseRank()))
b.UnMakeMove(b.CurrentMove)
ok := (!incheck) && (!oppincheck) && (!blackmated)
if !ok {
//fmt.Printf("move thrown out for check %s\n",b.CurrentMove.ToAlgeb())
}
if ok {
if b.BestMoveDone || (b.CurrentMove != b.BestMove) {
// move is ok
if piece.TypeOf(b.CurrentMove.Piece) == piece.KING {
if square.RankOf(b.CurrentMove.To) > square.RankOf(b.CurrentMove.From) {
b.CurrentMove.IsForwardKingMove = true
}
}
return true
}
}
}
return false
}
func (b *TBoard) KingOnBaseRank(c piece.TColor) bool {
return (square.RankOf(b.GetKingPos(c)) == 0)
}