r1bb3r/1pp3pp/4k3/pP1pnp1P/P2n1P2/2NP4/1QP1P3/1R2KBBR b K - 1 21
FEN state: r1bb3r/1pp3pp/4k3/pP1pnp1P/P2n1P2/2NP4/1QP1P3/1R2KBBR b K - 1 21 ; Best move: e5f3
The current state of the chess board is: Black rook at a8, black bishop at c8, black bishop at d8 and black rook at h8. Black pawn at b7, black pawn at c7, black pawn at g7 and black pawn at h7. Black king at e6. Black pawn at a5, white pawn at b5, black pawn at d5, black knight at e5, black pawn at f5 and white pawn at h5. White pawn at a4, black knight at d4 and white pawn at f4. White knight at c3 and white pawn at d3. White queen at b2, white pawn at c2 and white pawn at e2. White rook at b1, white king at e1, white bishop at f1, white bishop at g1 and white rook at h1. White kingside is the only castle move available. Half move number is 1. Full move number is 21. Black to move.