Checkshogi AI compatibility

[Eventlesstew]

Since Fairy Stockfish can play 3-check Chess just fine, I think it makes sense that it can also play Checkshogi as well.

[rasc42]

It was actually added today =)

[Eventlesstew]

Ik, but you can't select it when playing against computer players.

[ddugovic]

Fabian provided guidance about how to use Fairy-Stockfish variant configuration for those interested in analyzing such games on their PCs:

Just learned that checkshogi has been added. If you need an engine for it, Fairy-SF should work, assuming I understand the rules correctly. Variant config could e.g. be as simple as:

[checkshogi:shogi]
checkCounting = true

If the variant should be available as built-in for use in lishogi, just let me know, should be no problem to add that.

... and I confirmed that from a Linux command line, his advice is accurate... input:

make build ARCH=x86-64-bmi2 largeboards=yes
./stockfish
usi
setoption name VariantPath value checkshogi.ini
setoption name USI_Variant value checkshogi
position sfen ln1gk1s1l/4rg3/p2spp1p1/1p1p2p1p/3N1n3/P1P3P2/1P1PPP1PP/1S1GGS2R/L3K2NL b BPb 39
d
go depth 1

based upon position https://lishogi.org/NSUhWdAz#38 produces output:

info string variant checkshogi files 9 ranks 9 pocket 10 template shogi startpos lnsgkgsnl/1r5b1/ppppppppp/9/9/9/PPPPPPPPP/1B5R1/LNSGKGSNL[-] w 0 1

 +---+---+---+---+---+---+---+---+---+
 | l | n |   | g | k |   | s |   | l |9   [b]
 +---+---+---+---+---+---+---+---+---+
 |   |   |   |   | r | g |   |   |   |8
 +---+---+---+---+---+---+---+---+---+
 | p |   |   | s | p | p |   | p |   |7
 +---+---+---+---+---+---+---+---+---+
 |   | p |   | p |   |   | p |   | p |6
 +---+---+---+---+---+---+---+---+---+
 |   |   |   | N |   | n |   |   |   |5
 +---+---+---+---+---+---+---+---+---+
 | P |   | P |   |   |   | P |   |   |4
 +---+---+---+---+---+---+---+---+---+
 |   | P |   | P | P | P |   | P | P |3
 +---+---+---+---+---+---+---+---+---+
 |   | S |   | G | G | S |   |   | R |2
 +---+---+---+---+---+---+---+---+---+
 | L |   |   |   | K |   |   | N | L |1 * [PB]
 +---+---+---+---+---+---+---+---+---+
   a   b   c   d   e   f   g   h   i

Fen: ln1gk1s1l/4rg3/p2spp1p1/1p1p2p1p/3N1n3/P1P3P2/1P1PPP1PP/1S1GGS2R/L3K2NL[PBb] w - - 1+1 0 20
Sfen: ln1gk1s1l/4rg3/p2spp1p1/1p1p2p1p/3N1n3/P1P3P2/1P1PPP1PP/1S1GGS2R/L3K2NL b PBb 39
Key: EADF29CC15E431D1
Checkers:
Chased:
info string classical evaluation enabled
info depth 1 seldepth 1 multipv 1 score mate 1 nodes 93 nps 46500 tbhits 0 time 2 pv B*7c
bestmove B*7c

[ddugovic]

https://lishogi.org/@/FrogfuciusBot is now deployed with Fairy-Stockfish and accepts checkshogi game requests.