rn3br1/p1p1k3/bP2q2n/3p1p2/3P1pp1/1PBBPN1p/P5PP/RN2KQ1R w KQ - 0 21
FEN state: rn3br1/p1p1k3/bP2q2n/3p1p2/3P1pp1/1PBBPN1p/P5PP/RN2KQ1R w KQ - 0 21 ; Best move: b6b7
The current state of the chess board is: Black rook at a8, black knight at b8, black bishop at f8 and black rook at g8. Black pawn at a7, black pawn at c7 and black king at e7. Black bishop at a6, white pawn at b6, black queen at e6 and black knight at h6. Black pawn at d5 and black pawn at f5. White pawn at d4, black pawn at f4 and black pawn at g4. White pawn at b3, white bishop at c3, white bishop at d3, white pawn at e3, white knight at f3 and black pawn at h3. White pawn at a2, white pawn at g2 and white pawn at h2. White rook at a1, white knight at b1, white king at e1, white queen at f1 and white rook at h1. White kingside and white queenside castles are available. Half move number is 0. Full move number is 21. White to move.