1rb1kb1r/p1qp3p/n1p1p1p1/1pP2p1P/P2P1P2/4B3/1P2P1P1/Rn1K1BNR b k - 0 20
FEN state: 1rb1kb1r/p1qp3p/n1p1p1p1/1pP2p1P/P2P1P2/4B3/1P2P1P1/Rn1K1BNR b k - 0 20 ; Best move: g6g5
The current state of the chess board is: Black rook at b8, black bishop at c8, black king at e8, black bishop at f8 and black rook at h8. Black pawn at a7, black queen at c7, black pawn at d7 and black pawn at h7. Black knight at a6, black pawn at c6, black pawn at e6 and black pawn at g6. Black pawn at b5, white pawn at c5, black pawn at f5 and white pawn at h5. White pawn at a4, white pawn at d4 and white pawn at f4. White bishop at e3. White pawn at b2, white pawn at e2 and white pawn at g2. White rook at a1, black knight at b1, white king at d1, white bishop at f1, white knight at g1 and white rook at h1. Black kingside is the only castle move available. Half move number is 0. Full move number is 20. Black to move.