Version 1.4

README.md

@@ -1,9 +1,9 @@
 # chess22k
 
 A chessengine build in Java that uses the UCI protocol to communicate with graphical interfaces.
-Should be used with a 64 bit JRE. Score is about 2500 elo.
+Should be used with a 64 bit JRE. Score is about 2600 elo.
 
-###Features
+## Features
 - (magic) bitboards
 - transposition tables
 - (internal) iterative-deepening
@@ -12,19 +12,17 @@ Should be used with a 64 bit JRE. Score is about 2500 elo.
 - (static) null move pruning
 - razoring
 - late move reductions
+- futility pruning
 - static exchange evaluation
 - aspiration window
+- evaluation scores tuned using the Texel's tuning method
 - no openingbook or endgame tablebases
 - no pondering
 
-###Future
-- fix certain node-explosions in endgames
-- futility pruning
+## Future
 - tapered eval
-- tweak values
 - ...
 
 
-
 _"Simplicity is the soul of efficiency"_       - Austin Freeman -
 

pom.xml

@@ -6,9 +6,9 @@
 
 	<!-- so we can simply build other (experimental) artifacts -->
 	<!-- artifactId>${engineName}</artifactId -->
-
 	<artifactId>chess22k</artifactId>
-	<version>1.3</version>
+
+	<version>1.4</version>
 
 	<properties>
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
@@ -33,6 +33,7 @@
 					<excludes>
 						<exclude>**/unittests/*</exclude>
 						<exclude>**/maintests/*</exclude>
+						<exclude>**/texel/*</exclude>
 					</excludes>
 				</configuration>
 			</plugin>

release-notes.txt

@@ -1,3 +1,9 @@
+1.4 - 18-06-2017 - 2600 elo
+- tuned evaluation values using the Texel's tuning method
+- implemented futility pruning
+- small tweaks
+
+
 1.3 - 26-04-2017 - 2500 elo
 - enabled king-safety (based on Ed Schröders idea)
 - implemented razoring

src/main/java/nl/s22k/chess/Bitboard.java

@@ -0,0 +1,152 @@
+package nl.s22k.chess;
+
+public class Bitboard {
+
+	// rank 1
+	public static final long H1 = 1L;
+	public static final long G1 = H1 << 1;
+	public static final long F1 = G1 << 1;
+	public static final long E1 = F1 << 1;
+	public static final long D1 = E1 << 1;
+	public static final long C1 = D1 << 1;
+	public static final long B1 = C1 << 1;
+	public static final long A1 = B1 << 1;
+
+	// rank 2
+	public static final long H2 = A1 << 1;
+	public static final long G2 = H2 << 1;
+	public static final long F2 = G2 << 1;
+	public static final long E2 = F2 << 1;
+	public static final long D2 = E2 << 1;
+	public static final long C2 = D2 << 1;
+	public static final long B2 = C2 << 1;
+	public static final long A2 = B2 << 1;
+
+	// rank 3
+	public static final long H3 = A2 << 1;
+	public static final long G3 = H3 << 1;
+	public static final long F3 = G3 << 1;
+	public static final long E3 = F3 << 1;
+	public static final long D3 = E3 << 1;
+	public static final long C3 = D3 << 1;
+	public static final long B3 = C3 << 1;
+	public static final long A3 = B3 << 1;
+
+	// rank 4
+	public static final long H4 = A3 << 1;
+	public static final long G4 = H4 << 1;
+	public static final long F4 = G4 << 1;
+	public static final long E4 = F4 << 1;
+	public static final long D4 = E4 << 1;
+	public static final long C4 = D4 << 1;
+	public static final long B4 = C4 << 1;
+	public static final long A4 = B4 << 1;
+
+	// rank 5
+	public static final long H5 = A4 << 1;
+	public static final long G5 = H5 << 1;
+	public static final long F5 = G5 << 1;
+	public static final long E5 = F5 << 1;
+	public static final long D5 = E5 << 1;
+	public static final long C5 = D5 << 1;
+	public static final long B5 = C5 << 1;
+	public static final long A5 = B5 << 1;
+
+	// rank 6
+	public static final long H6 = A5 << 1;
+	public static final long G6 = H6 << 1;
+	public static final long F6 = G6 << 1;
+	public static final long E6 = F6 << 1;
+	public static final long D6 = E6 << 1;
+	public static final long C6 = D6 << 1;
+	public static final long B6 = C6 << 1;
+	public static final long A6 = B6 << 1;
+
+	// rank 7
+	public static final long H7 = A6 << 1;
+	public static final long G7 = H7 << 1;
+	public static final long F7 = G7 << 1;
+	public static final long E7 = F7 << 1;
+	public static final long D7 = E7 << 1;
+	public static final long C7 = D7 << 1;
+	public static final long B7 = C7 << 1;
+	public static final long A7 = B7 << 1;
+
+	// rank 8
+	public static final long H8 = A7 << 1;
+	public static final long G8 = H8 << 1;
+	public static final long F8 = G8 << 1;
+	public static final long E8 = F8 << 1;
+	public static final long D8 = E8 << 1;
+	public static final long C8 = D8 << 1;
+	public static final long B8 = C8 << 1;
+	public static final long A8 = B8 << 1;
+
+	// special squares
+	public static final long A1_B1 = A1 | B1;
+	public static final long A1_D1 = A1 | D1;
+	public static final long B1_C1 = B1 | C1;
+	public static final long C1_D1 = C1 | D1;
+	public static final long C1_G1 = C1 | G1;
+	public static final long D1_F1 = D1 | F1;
+	public static final long F1_G1 = F1 | G1;
+	public static final long F1_H1 = F1 | H1;
+	public static final long F1_H8 = F1 | H8;
+	public static final long G1_H1 = G1 | H1;
+	public static final long A8_B8 = A8 | B8;
+	public static final long A8_D8 = A8 | D8;
+	public static final long B8_C8 = B8 | C8;
+	public static final long C8_G8 = C8 | G8;
+	public static final long D8_F8 = D8 | F8;
+	public static final long F8_G8 = F8 | G8;
+	public static final long F8_H8 = F8 | H8;
+	public static final long G8_H8 = G8 | H8;
+	public static final long B1_C1_D1 = B1 | C1 | D1;
+	public static final long B8_C8_D8 = B8 | C8 | D8;
+	public static final long A1_B1_A2_B2 = A1 | B1 | A2 | B2;
+	public static final long D1_E1_D2_E2 = D1 | E1 | D2 | E2;
+	public static final long G1_H1_G2_H2 = G1 | H1 | G2 | H2;
+	public static final long D7_E7_D8_E8 = D7 | E7 | D8 | E8;
+	public static final long A7_B7_A8_B8 = A7 | B7 | A8 | B8;
+	public static final long G7_H7_G8_H8 = G7 | H7 | G8 | H8;
+	public static final long WHITE_SQUARES = 0xaa55aa55aa55aa55L;
+	public static final long BLACK_SQUARES = ~WHITE_SQUARES;
+
+	// ranks
+	public static final long RANK_1 = A1 | B1 | C1 | D1 | E1 | F1 | G1 | H1;
+	public static final long RANK_2 = A2 | B2 | C2 | D2 | E2 | F2 | G2 | H2;
+	public static final long RANK_3 = A3 | B3 | C3 | D3 | E3 | F3 | G3 | H3;
+	public static final long RANK_4 = A4 | B4 | C4 | D4 | E4 | F4 | G4 | H4;
+	public static final long RANK_5 = A5 | B5 | C5 | D5 | E5 | F5 | G5 | H5;
+	public static final long RANK_6 = A6 | B6 | C6 | D6 | E6 | F6 | G6 | H6;
+	public static final long RANK_7 = A7 | B7 | C7 | D7 | E7 | F7 | G7 | H7;
+	public static final long RANK_8 = A8 | B8 | C8 | D8 | E8 | F8 | G8 | H8;
+
+	// special ranks
+	public static final long RANK_12 = RANK_1 | RANK_2;
+	public static final long RANK_78 = RANK_7 | RANK_8;
+	public static final long RANK_2345 = RANK_2 | RANK_3 | RANK_4 | RANK_5;
+	public static final long RANK_4567 = RANK_4 | RANK_5 | RANK_6 | RANK_7;
+	public static final long RANK_PROMOTION[] = new long[] { RANK_7, RANK_2 };
+
+	// files
+	public static final long FILE_A = A1 | A2 | A3 | A4 | A5 | A6 | A7 | A8;
+	public static final long FILE_B = B1 | B2 | B3 | B4 | B5 | B6 | B7 | B8;
+	public static final long FILE_C = C1 | C2 | C3 | C4 | C5 | C6 | C7 | C8;
+	public static final long FILE_D = D1 | D2 | D3 | D4 | D5 | D6 | D7 | D8;
+	public static final long FILE_E = E1 | E2 | E3 | E4 | E5 | E6 | E7 | E8;
+	public static final long FILE_F = F1 | F2 | F3 | F4 | F5 | F6 | F7 | F8;
+	public static final long FILE_G = G1 | G2 | G3 | G4 | G5 | G6 | G7 | G8;
+	public static final long FILE_H = H1 | H2 | H3 | H4 | H5 | H6 | H7 | H8;
+	public static final long NOT_FILE_A = ~FILE_A;
+	public static final long NOT_FILE_H = ~FILE_H;
+
+	public static final long RANKS[] = new long[] { RANK_1, RANK_2, RANK_3, RANK_4, RANK_5, RANK_6, RANK_7, RANK_8 };
+	public static final long FILES[] = new long[] { FILE_H, FILE_G, FILE_F, FILE_E, FILE_D, FILE_C, FILE_B, FILE_A };
+	public static final long FILES_ADJACENT[] = new long[] { FILE_G, FILE_H | FILE_F, FILE_G | FILE_E, FILE_F | FILE_D, FILE_E | FILE_C, FILE_D | FILE_B,
+			FILE_C | FILE_A, FILE_B };
+
+	public static final long KING_SIDE = FILE_F | FILE_G | FILE_H;
+	public static final long QUEEN_SIDE = FILE_A | FILE_B | FILE_C;
+
+}