New engine _Crab_ based on StockFish

[Look]

Hi,

Here is code of a new engine based on StockFish 1.7.1 called Crab 1.0 beta. Changes in it are few mostly in evaluate.cpp. Some hacks was made in it to compile it for myself, so let me know if it could not be compiled correctly. Consider Crab as a new personality of SF. Do not care about its strength though, its Crab!
http://www.mediafire.com/?ztewrmyjyhe

[Dann Corbit]

Are there important differences besides the changes to these two arrays?

Code: Select all

// Isolated pawn penalty by file
const Score IsolatedPawnPenalty[8] = {
    S(25, 30), S(36, 35), S(40, 35), S(40, 35),
    S(40, 35), S(40, 35), S(36, 35), S(25, 30)
};

// Pawn chain membership bonus by file
const Score ChainBonus[8] = {
    S(11,-1), S(13,-1), S(13,-1), S(14,-1),
    S(14,-1), S(13,-1), S(13,-1), S(11,-1)
};

Code: Select all

// Isolated pawn penalty by file
const Score IsolatedPawnPenalty[8] = {//mmm
    S(22, 27), S(32, 32), S(36, 32), S(36, 32),
    S(36, 32), S(36, 32), S(32, 32), S(22, 27)
};

// Pawn chain membership bonus by file
const Score ChainBonus[8] = {//mmm
    S(11,0), S(13,0), S(13,0), S(14,0),
    S(14,0), S(13,0), S(13,0), S(11,0)
};

[Look]

Well as usual I forgot to tell some key points. I have tried to make changes clear by using // mmm comments. Search for them in the code and compare to official SF 1.7.1 . Among changes are RookOutpostBonus, QueenOutpostBonus bonuses and new functions is_pure_pawn_eg, is_single_same_piece_eg. To see its style of play you may simply watch its games and see if it plays differently.

[Dann Corbit]

Well as usual I forgot to tell some key points. I have tried to make changes clear by using // mmm comments. Search for them in the code and compare to official SF 1.7.1 . Among changes are RookOutpostBonus, QueenOutpostBonus bonuses and new functions is_pure_pawn_eg, is_single_same_piece_eg. To see its style of play you may simply watch its games and see if it plays differently.

Thanks.

[Look]

Well as usual I forgot to tell some key points. I have tried to make changes clear by using // mmm comments. Search for them in the code and compare to official SF 1.7.1 . Among changes are RookOutpostBonus, QueenOutpostBonus bonuses and new functions is_pure_pawn_eg, is_single_same_piece_eg. To see its style of play you may simply watch its games and see if it plays differently.

[Dr.Wael Deeb]

Well as usual I forgot to tell some key points. I have tried to make changes clear by using // mmm comments. Search for them in the code and compare to official SF 1.7.1 . Among changes are RookOutpostBonus, QueenOutpostBonus bonuses and new functions is_pure_pawn_eg, is_single_same_piece_eg. To see its style of play you may simply watch its games and see if it plays differently.

You're repeating yourself....
Dr.D

[Look]

Hi Dr.D,
The good news is that it would not make me anymore psycho , you know...

[mcostalba]

Hi,

Here is code of a new engine based on StockFish 1.7.1 called Crab 1.0 beta. Changes in it are few mostly in evaluate.cpp. Some hacks was made in it to compile it for myself, so let me know if it could not be compiled correctly. Consider Crab as a new personality of SF. Do not care about its strength though, its Crab!
http://www.mediafire.com/?ztewrmyjyhe

Nice ! As soon as we come out fom this regression nightmare (see the other thread) I will take a look at it.

BTW have you tested Crab against 1.7.1 and found it is stronger (please say yes ), and how you tested it, I mean how many games and with what time control ?

[Albert Silver]

Hi,

Here is code of a new engine based on StockFish 1.7.1 called Crab 1.0 beta. Changes in it are few mostly in evaluate.cpp. Some hacks was made in it to compile it for myself, so let me know if it could not be compiled correctly. Consider Crab as a new personality of SF. Do not care about its strength though, its Crab!
http://www.mediafire.com/?ztewrmyjyhe

I don't suppose you, or someone else could compile it pls?

[Look]

Hi,

@Albert Silver

Sorry I am not good at compiling, so I am leaving it to others who are.