rn3k1r/p2qnbp1/7p/2p1p3/3Ppp2/1QP2P1P/PPBK2P1/RNB3NR w - - 4 21
FEN state: rn3k1r/p2qnbp1/7p/2p1p3/3Ppp2/1QP2P1P/PPBK2P1/RNB3NR w - - 4 21 ; Best move: b3a4
The current state of the chess board is: Black rook at a8, black knight at b8, black king at f8 and black rook at h8. Black pawn at a7, black queen at d7, black knight at e7, black bishop at f7 and black pawn at g7. Black pawn at h6. Black pawn at c5 and black pawn at e5. White pawn at d4, black pawn at e4 and black pawn at f4. White queen at b3, white pawn at c3, white pawn at f3 and white pawn at h3. White pawn at a2, white pawn at b2, white bishop at c2, white king at d2 and white pawn at g2. White rook at a1, white knight at b1, white bishop at c1, white knight at g1 and white rook at h1. Both players have exhausted their castles. Half move number is 4. Full move number is 21. White to move.