r3kb1r/3qn3/1pQ2pbp/pNpp2p1/1P1pP3/5P2/P1RP1K1P/2B2BNR w k - 0 23
FEN state: r3kb1r/3qn3/1pQ2pbp/pNpp2p1/1P1pP3/5P2/P1RP1K1P/2B2BNR w k - 0 23 ; Best move: b5d6
The current state of the chess board is: Black rook at a8, black king at e8, black bishop at f8 and black rook at h8. Black queen at d7 and black knight at e7. Black pawn at b6, white queen at c6, black pawn at f6, black bishop at g6 and black pawn at h6. Black pawn at a5, white knight at b5, black pawn at c5, black pawn at d5 and black pawn at g5. White pawn at b4, black pawn at d4 and white pawn at e4. White pawn at f3. White pawn at a2, white rook at c2, white pawn at d2, white king at f2 and white pawn at h2. White bishop at c1, 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 23. White to move.