1n1bkq1r/6pp/2bppp2/rp1n4/NP2P1P1/2PP1Q1P/P3KPB1/R1B3NR w k - 0 21
FEN state: 1n1bkq1r/6pp/2bppp2/rp1n4/NP2P1P1/2PP1Q1P/P3KPB1/R1B3NR w k - 0 21 ; Best move: b4a5
The current state of the chess board is: Black knight at b8, black bishop at d8, black king at e8, black queen at f8 and black rook at h8. Black pawn at g7 and black pawn at h7. Black bishop at c6, black pawn at d6, black pawn at e6 and black pawn at f6. Black rook at a5, black pawn at b5 and black knight at d5. White knight at a4, white pawn at b4, white pawn at e4 and white pawn at g4. White pawn at c3, white pawn at d3, white queen at f3 and white pawn at h3. White pawn at a2, white king at e2, white pawn at f2 and white bishop at g2. White rook at a1, white bishop at c1, 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 21. White to move.