r1b1kr2/pp1pnp1p/n1p5/1q6/4pP2/N2BP2P/P1PP3R/3QK1N1 w q - 0 21
FEN state: r1b1kr2/pp1pnp1p/n1p5/1q6/4pP2/N2BP2P/P1PP3R/3QK1N1 w q - 0 21 ; Best move: d3b5
The current state of the chess board is: Black rook at a8, black bishop at c8, black king at e8 and black rook at f8. Black pawn at a7, black pawn at b7, black pawn at d7, black knight at e7, black pawn at f7 and black pawn at h7. Black knight at a6 and black pawn at c6. Black queen at b5. Black pawn at e4 and white pawn at f4. White knight at a3, white bishop at d3, white pawn at e3 and white pawn at h3. White pawn at a2, white pawn at c2, white pawn at d2 and white rook at h2. White queen at d1, white king at e1 and white knight at g1. Black queenside is the only castle move available. Half move number is 0. Full move number is 21. White to move.