Good find -- I thought those FEN strings would turn something up -- I checked against the benchmark positions in Critter and Stockfish before I stopped looking. No surprise. Nice that he made an OSX version.User923005 wrote:Black Mamba is definitely an Ivanhoe clone.
It even has this table embedded in it:
char BENCHMARK_POS[16][128]=
{"rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1",
"rnbqkb1r/pppp1ppp/4pn2/8/2PP4/2N5/PP2PPPP/R1BQKBNR b KQkq - 1 3",
"rnbqkb1r/pp2pppp/1n1p4/8/2PP4/8/PP3PPP/RNBQKBNR w KQkq - 0 6",
"r1bq1rk1/pppp1ppp/5n2/4n3/2P5/1PN3P1/P2PPKBP/R1BQ3R b - - 0 8",
"r4rk1/ppqbbppp/2nppn2/8/4PP2/1NN1B3/PPP1B1PP/R2Q1RK1 w - - 1 11",
"r2q1rk1/1pp2ppp/p1pbb3/4P3/4NB2/8/PPP2PPP/R2QR1K1 b - - 0 13",
"r4rk1/3np1bp/pq1p2p1/2pP3n/6P1/2N1Bp2/PPQ1BPP1/R4RK1 w - - 0 16",
"rnb2r2/p1p2pk1/1p1pqn1p/P7/Q1PPp1pP/2P3P1/4PPB1/1RB1K1NR b K - 3 18",
"4rk1r/1b2pNbp/pq2Bn1p/1ppP4/P1p2Q2/2N4P/1P3PP1/R3K2R w KQ - 8 21",
"r3r1k1/2p1np1p/1p2p1pB/p1q1P3/P1P1Q3/3R3P/1P3PP1/5RK1 b - - 2 23",
"r2q1r1k/6np/1p1p1pp1/pNpPn3/P1P1P1P1/1PB1Q2P/5R2/5R1K w - - 0 26",
"2kn4/ppN1R3/3p4/6rp/2NP3n/2P5/PP5r/4KR2 b - - 4 28",
"r1br2k1/pp4p1/4p1Bp/4P3/2Rp3N/4n1P1/PP2P2P/R5K1 w - - 8 31",
"6k1/1p3pp1/p2p4/3P1P2/P1Bpn3/1P2q3/2P4P/5Q1K b - - 0 33",
"4q3/r4pkp/1p1P4/2n1P1p1/2Q2b2/7P/2R1B1P1/5R1K w - - 0 36",
"3rr1k1/p4pbp/2bN1p2/8/2B3P1/2P3Bn/P2N4/3R1K2 b - - 1 38"};
See:
http://ivanhoebuilds.googlecode.com/svn ... enchmark.c
To see for yourself, just run strings.exe against the blackmamba binary. It's at the end.
To be fair, he does mention Fire, Ivanhoe and Robbolito in his page:
https://sites.google.com/site/mdannib/ringraziamenti
And Ivanhoe was released as public domain.
So, you get what you pay for.
The strings are used with the command "benchmark x" (x is the selectep depth) from the uci interface; this is used only for the PGO compile as Stockfish does.Jeremy Bernstein wrote:
Good find -- I thought those FEN strings would turn something up -- I checked against the benchmark positions in Critter and Stockfish before I stopped looking. No surprise. Nice that he made an OSX version.
jb
Velmarim, i m just saying that the fen used for the optimization fase during the compile is not a "concrete evidence".velmarin wrote:compared to program Similarity_3,
60% with Ivanhoe and Fire
http://i35.fastpic.ru/big/2012/0411/12/ ... 527012.png
Code: Select all
w_undeveloped = b_undeveloped = 0;
dev_val = 0;
DYNAMIC->threat = 0;
DYNAMIC->eval_hash_hit = 0;
index = (DYNAMIC->material >> 8) & 0x7ffff;
SIGN = MATERIAL[index].sign;
DYNAMIC->flags = MATERIAL[index].flags;
if (!(DYNAMIC->material & 0x80000000)) {
Material_value = MATERIAL[index].value;
Material_value *= (int)((MATERIAL_WEIGHTING << 10) / 100);
Material_value >>= 10;
}
else
{
if (POPCNT_M15(bWq) > 1
|| POPCNT_M15(bBq) > 1
|| POPCNT_M15(bWr) > 2
|| POPCNT_M15(bBr) > 2
|| POPCNT_M15(bWl) > 1
|| POPCNT_M15(bBl) > 1
|| POPCNT_M15(bWd) > 1
|| POPCNT_M15(bBd) > 1
|| POPCNT_M15(bWn) > 2
|| POPCNT_M15(bBn) > 2)
{
SIGN = 128;
Material_value = value_material();
DYNAMIC->flags = 0;
if (bWq | bWr | bWb | bWn)
DYNAMIC->flags |= 2;
if (bBq | bBr | bBb | bBn)
DYNAMIC->flags |= 1;
}
else
{
Material_value = MATERIAL[index].value;
DYNAMIC->material &= 0x7fffffff;
}
}
Code: Select all
/////////////////////
// Eternal Knight
/////////////////////
U = bWn;
while (U)
{
b = LSB(U);
bit_free(b, U);
if ((b == D5 || b == E5)
&& !(attacked_by_black_knight & U)
&& !(attacked_by_black_bishop & U))
value += eternal_knight;
}
U = bBn;
while (U)
{
b = LSB(U);
bit_free(b, U);
if ((b == D5 || b == E5)
&& !(attacked_by_white_knight & U)
&& !(attacked_by_white_bishop & U))
value -= eternal_knight;
}
Code: Select all
// controllo se e' un pedone che puo attaccare il re nemico
if (rank >= R4) {
f_bk = FILE(black_king_square);
if ((rank == R4) && (file == f_bk || file == (f_bk + 1) || file == (f_bk -1)))
value += pawn_storm_R4;
else if ((rank == R5) && (file == f_bk || file == (f_bk + 1) || file == (f_bk -1)))
value += pawn_storm_R5;
else if ((rank == R6) && (file == f_bk || file == (f_bk + 1) || file == (f_bk -1)))
value += pawn_storm_R6;
}
Code: Select all
/////////////////////
// Interaction
/////////////////////
// WHITE
// two minors
U = ((interaction_wn_1 | interaction_wn_2) & interaction_wb) | (interaction_wn_1 & interaction_wn_2);
U &= (~bitboard_occupied_white);
if (U) {
if (U & bBk)
value += 5 * POPCNT(U)* two_minors;
else
value += POPCNT(U)* two_minors;
}
// minor and rook
U = interaction_wr & ((interaction_wn_1 | interaction_wn_2) | interaction_wb);
U &= (~bitboard_occupied_white);
if (U) {
if (U & bBk)
value += 5 * POPCNT(U)* minor_and_rook;
else
value += POPCNT(U)* minor_and_rook;
}