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posValues.go
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posValues.go
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/*
* FrankyGo - UCI chess engine in GO for learning purposes
*
* MIT License
*
* Copyright (c) 2018-2020 Frank Kopp
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
package types
import (
"github.com/frankkopp/FrankyGo/internal/assert"
)
// PosMidValue returns the pre computed positional value
// for the piece on the given square in mid game
func PosMidValue(p Piece, sq Square) Value {
if assert.DEBUG {
assert.Assert(initialized, "Pos values have not been initialized. Please call types.Init() first.")
}
return posMidValue[p][sq]
}
// PosEndValue returns the pre computed positional value
// for the piece on the given square in end game
func PosEndValue(p Piece, sq Square) Value {
if assert.DEBUG {
assert.Assert(initialized, "Pos values have not been initialized. Please call types.Init() first.")
}
return posEndValue[p][sq]
}
// PosValue returns the pre computed positional value
// for the piece on the given square and given game phase
func PosValue(p Piece, sq Square, gp int) Value {
if assert.DEBUG {
assert.Assert(initialized, "Pos values have not been initialized. Please call types.Init() first.")
}
return posValue[p][sq][gp]
}
// initPosValues pre computes arrays containing the positional values of each piece
// for each square and game phase
func initPosValues() {
// all game phases
for pc := WhiteKing; pc <= BlackQueen; pc++ {
for sq := SqA1; sq <= SqH8; sq++ {
for gp := GamePhaseMax; gp >= 0; gp-- {
switch pc {
case WhiteKing:
posMidValue[pc][sq] = kingMidGame[63-sq]
posEndValue[pc][sq] = kingEndGame[63-sq]
posValue[pc][sq][gp] = calcPosValueWhite(sq, gp, &kingMidGame, &kingEndGame)
case WhitePawn:
posMidValue[pc][sq] = pawnsMidGame[63-sq]
posEndValue[pc][sq] = pawnsEndGame[63-sq]
posValue[pc][sq][gp] = calcPosValueWhite(sq, gp, &pawnsMidGame, &pawnsEndGame)
case WhiteKnight:
posMidValue[pc][sq] = knightMidGame[63-sq]
posEndValue[pc][sq] = knightEndGame[63-sq]
posValue[pc][sq][gp] = calcPosValueWhite(sq, gp, &knightMidGame, &knightEndGame)
case WhiteBishop:
posMidValue[pc][sq] = bishopMidGame[63-sq]
posEndValue[pc][sq] = bishopEndGame[63-sq]
posValue[pc][sq][gp] = calcPosValueWhite(sq, gp, &bishopMidGame, &bishopEndGame)
case WhiteRook:
posMidValue[pc][sq] = rookMidGame[63-sq]
posEndValue[pc][sq] = rookEndGame[63-sq]
posValue[pc][sq][gp] = calcPosValueWhite(sq, gp, &rookMidGame, &rookEndGame)
case WhiteQueen:
posMidValue[pc][sq] = queenMidGame[63-sq]
posEndValue[pc][sq] = queenEndGame[63-sq]
posValue[pc][sq][gp] = calcPosValueWhite(sq, gp, &queenMidGame, &queenEndGame)
case BlackKing:
posMidValue[pc][sq] = kingMidGame[sq]
posEndValue[pc][sq] = kingEndGame[sq]
posValue[pc][sq][gp] = calcPosValueBlack(sq, gp, &kingMidGame, &kingEndGame)
case BlackPawn:
posMidValue[pc][sq] = pawnsMidGame[sq]
posEndValue[pc][sq] = pawnsEndGame[sq]
posValue[pc][sq][gp] = calcPosValueBlack(sq, gp, &pawnsMidGame, &pawnsEndGame)
case BlackKnight:
posMidValue[pc][sq] = knightMidGame[sq]
posEndValue[pc][sq] = knightEndGame[sq]
posValue[pc][sq][gp] = calcPosValueBlack(sq, gp, &knightMidGame, &knightEndGame)
case BlackBishop:
posMidValue[pc][sq] = bishopMidGame[sq]
posEndValue[pc][sq] = bishopEndGame[sq]
posValue[pc][sq][gp] = calcPosValueBlack(sq, gp, &bishopMidGame, &bishopEndGame)
case BlackRook:
posMidValue[pc][sq] = rookMidGame[sq]
posEndValue[pc][sq] = rookEndGame[sq]
posValue[pc][sq][gp] = calcPosValueBlack(sq, gp, &rookMidGame, &rookEndGame)
case BlackQueen:
posMidValue[pc][sq] = queenMidGame[sq]
posEndValue[pc][sq] = queenEndGame[sq]
posValue[pc][sq][gp] = calcPosValueBlack(sq, gp, &queenMidGame, &queenEndGame)
default:
}
}
}
}
}
func calcPosValueBlack(sq Square, gamePhase int, posMidTable *[SqLength]Value, posEndTable *[SqLength]Value) Value {
return (Value(gamePhase)*posMidTable[sq] + (Value(1-gamePhase) * posEndTable[sq])) / GamePhaseMax
}
func calcPosValueWhite(sq Square, gamePhase int, posMidTable *[SqLength]Value, posEndTable *[SqLength]Value) Value {
return (Value(gamePhase)*posMidTable[63-sq] + (Value(GamePhaseMax-gamePhase))*posEndTable[63-sq]) / GamePhaseMax
}
var (
posMidValue = [PieceLength][SqLength]Value{}
posEndValue = [PieceLength][SqLength]Value{}
posValue = [PieceLength][SqLength][GamePhaseMax + 1]Value{}
// positional values for pieces
// @formatter:off
// PAWN Tables
pawnsMidGame = [SqLength]Value {
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 5, 5, 5, 5, 5, 5, 0,
5, 5, 10, 30, 30, 10, 5, 5,
0, 0, 0, 30, 30, 0, 0, 0,
5, -5,-10, 0, 0,-10, -5, 5,
5, 10, 10,-30,-30, 10, 10, 5,
0, 0, 0, 0, 0, 0, 0, 0}
pawnsEndGame = [SqLength]Value {
0, 0, 0, 0, 0, 0, 0, 0,
90, 90, 90, 90, 90, 90, 90, 90,
40, 50, 50, 60, 60, 50, 50, 40,
20, 30, 30, 40, 40, 30, 30, 20,
10, 10, 20, 20, 20, 10, 10, 10,
5, 10, 10, 10, 10, 10, 10, 5,
5, 10, 10, 10, 10, 10, 10, 5,
0, 0, 0, 0, 0, 0, 0, 0}
// KNIGHT Tables
knightMidGame = [SqLength]Value {
-50,-40,-30,-30,-30,-30,-40,-50,
-40,-20, 0, 0, 0, 0,-20,-40,
-30, 0, 10, 15, 15, 10, 0,-30,
-30, 5, 15, 20, 20, 15, 5,-30,
-30, 0, 15, 20, 20, 15, 0,-30,
-30, 5, 10, 15, 15, 10, 5,-30,
-40,-20, 0, 5, 5, 0,-20,-40,
-50,-25,-20,-30,-30,-20,-25,-50}
knightEndGame = [SqLength]Value {
-50,-40,-30,-30,-30,-30,-40,-50,
-40,-20, 0, 0, 0, 0,-20,-40,
-30, 0, 10, 15, 15, 10, 0,-30,
-30, 0, 15, 20, 20, 15, 0,-30,
-30, 0, 15, 20, 20, 15, 0,-30,
-30, 0, 10, 15, 15, 10, 0,-30,
-40,-20, 0, 0, 0, 0,-20,-40,
-50,-40,-20,-30,-30,-20,-40,-50}
// BISHOP Tables
bishopMidGame = [SqLength]Value {
-20,-10,-10,-10,-10,-10,-10,-20,
-10, 0, 0, 0, 0, 0, 0,-10,
-10, 0, 5, 10, 10, 5, 0,-10,
-10, 5, 5, 10, 10, 5, 5,-10,
-10, 0, 10, 10, 10, 10, 0,-10,
-10, 10, 10, 10, 10, 10, 10,-10,
-10, 5, 0, 0, 0, 0, 5,-10,
-20,-10,-40,-10,-10,-40,-10,-20}
bishopEndGame = [SqLength]Value {
-20,-10,-10,-10,-10,-10,-10,-20,
-10, 0, 0, 0, 0, 0, 0,-10,
-10, 0, 5, 5, 5, 5, 0,-10,
-10, 0, 5, 10, 10, 5, 0,-10,
-10, 0, 5, 10, 10, 5, 0,-10,
-10, 0, 5, 5, 5, 5, 0,-10,
-10, 0, 0, 0, 0, 0, 0,-10,
-20,-10,-10,-10,-10,-10,-10,-20}
// ROOK Tables
rookMidGame = [SqLength]Value {
5, 5, 5, 5, 5, 5, 5, 5,
10, 10, 10, 10, 10, 10, 10, 10,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
-15,-10, 15, 15, 15, 15,-10,-15}
rookEndGame = [SqLength]Value {
5, 5, 5, 5, 5, 5, 5, 5,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0}
// Queen Tables
queenMidGame = [SqLength]Value {
-20,-10,-10, -5, -5,-10,-10,-20,
-10, 0, 0, 0, 0, 0, 0,-10,
-10, 0, 0, 0, 0, 0, 0,-10,
-5, 0, 2, 2, 2, 2, 0, -5,
-5, 0, 5, 5, 5, 5, 0, -5,
-10, 0, 5, 5, 5, 5, 0,-10,
-10, 0, 5, 5, 5, 5, 0,-10,
-20,-10,-10, -5, -5,-10,-10,-20}
queenEndGame = [SqLength]Value {
-20,-10,-10, -5, -5,-10,-10,-20,
-10, 0, 0, 0, 0, 0, 0,-10,
-10, 0, 5, 5, 5, 5, 0,-10,
-5, 0, 5, 5, 5, 5, 0, -5,
-5, 0, 5, 5, 5, 5, 0, -5,
-10, 0, 5, 5, 5, 5, 0,-10,
-10, 0, 0, 0, 0, 0, 0,-10,
-20,-10,-10, -5, -5,-10,-10,-20}
// King Tables
kingMidGame = [SqLength]Value {
-30,-40,-40,-50,-50,-40,-40,-30,
-30,-40,-40,-50,-50,-40,-40,-30,
-30,-40,-40,-50,-50,-40,-40,-30,
-30,-40,-40,-50,-50,-40,-40,-30,
-20,-30,-30,-40,-40,-30,-30,-20,
-10,-20,-20,-30,-30,-30,-20,-10,
0, 0,-20,-20,-20,-20, 0, 0,
20, 50, 0,-20,-20, 0, 50, 20}
kingEndGame = [SqLength]Value {
-50,-30,-30,-20,-20,-30,-30,-50,
-30,-20,-10, 0, 0,-10,-20,-30,
-30,-10, 20, 30, 30, 20,-10,-30,
-30,-10, 30, 40, 40, 30,-10,-30,
-30,-10, 30, 40, 40, 30,-10,-30,
-30,-10, 20, 30, 30, 20,-10,-30,
-30,-30, 0, 0, 0, 0,-30,-30,
-50,-30,-30,-30,-30,-30,-30,-50}
// @formatter:on
)