2bn3r/1rpqk1bp/4ppp1/p7/NpPPp3/5QBP/PP3PP1/1R2KBNR w K - 4 20
FEN state: 2bn3r/1rpqk1bp/4ppp1/p7/NpPPp3/5QBP/PP3PP1/1R2KBNR w K - 4 20 ; Best move: f3b3
The current state of the chess board is: Black bishop at c8, black knight at d8 and black rook at h8. Black rook at b7, black pawn at c7, black queen at d7, black king at e7, black bishop at g7 and black pawn at h7. Black pawn at e6, black pawn at f6 and black pawn at g6. Black pawn at a5. White knight at a4, black pawn at b4, white pawn at c4, white pawn at d4 and black pawn at e4. White queen at f3, white bishop at g3 and white pawn at h3. White pawn at a2, white pawn at b2, white pawn at f2 and white pawn at g2. White rook at b1, white king at e1, white bishop at f1, white knight at g1 and white rook at h1. White kingside is the only castle move available. Half move number is 4. Full move number is 20. White to move.