1nb1kb2/5p2/p1p1rnr1/1q1p4/RPP1pPpp/3PP1P1/3BB2P/1Q2K1NR b K - 3 20
FEN state: 1nb1kb2/5p2/p1p1rnr1/1q1p4/RPP1pPpp/3PP1P1/3BB2P/1Q2K1NR b K - 3 20 ; Best move: b5a4
The current state of the chess board is: Black knight at b8, black bishop at c8, black king at e8 and black bishop at f8. Black pawn at f7. Black pawn at a6, black pawn at c6, black rook at e6, black knight at f6 and black rook at g6. Black queen at b5 and black pawn at d5. White rook at a4, white pawn at b4, white pawn at c4, black pawn at e4, white pawn at f4, black pawn at g4 and black pawn at h4. White pawn at d3, white pawn at e3 and white pawn at g3. White bishop at d2, white bishop at e2 and white pawn at h2. White queen at b1, white king at e1, white knight at g1 and white rook at h1. White kingside is the only castle move available. Half move number is 3. Full move number is 20. Black to move.