rn3b1r/pp1k1p1p/2p2n2/4p1pb/1qB5/P1P1P1NN/3PQPPP/RKB4R w - - 0 21
FEN state: rn3b1r/pp1k1p1p/2p2n2/4p1pb/1qB5/P1P1P1NN/3PQPPP/RKB4R w - - 0 21 ; Best move: a3b4
The current state of the chess board is: Black rook at a8, black knight at b8, black bishop at f8 and black rook at h8. Black pawn at a7, black pawn at b7, black king at d7, black pawn at f7 and black pawn at h7. Black pawn at c6 and black knight at f6. Black pawn at e5, black pawn at g5 and black bishop at h5. Black queen at b4 and white bishop at c4. White pawn at a3, white pawn at c3, white pawn at e3, white knight at g3 and white knight at h3. White pawn at d2, white queen at e2, white pawn at f2, white pawn at g2 and white pawn at h2. White rook at a1, white king at b1, white bishop at c1 and white rook at h1. Both players have exhausted their castles. Half move number is 0. Full move number is 21. White to move.