2b2bnr/1r1pq1p1/pp2k1P1/2p2p1p/P3pP2/R1P4P/1BnPP1N1/4KBNR w K - 0 21
FEN state: 2b2bnr/1r1pq1p1/pp2k1P1/2p2p1p/P3pP2/R1P4P/1BnPP1N1/4KBNR w K - 0 21 ; Best move: e1f2
The current state of the chess board is: Black bishop at c8, black bishop at f8, black knight at g8 and black rook at h8. Black rook at b7, black pawn at d7, black queen at e7 and black pawn at g7. Black pawn at a6, black pawn at b6, black king at e6 and white pawn at g6. Black pawn at c5, black pawn at f5 and black pawn at h5. White pawn at a4, black pawn at e4 and white pawn at f4. White rook at a3, white pawn at c3 and white pawn at h3. White bishop at b2, black knight at c2, white pawn at d2, white pawn at e2 and white knight at g2. White king at e1, white bishop at f1, white knight at g1 and white rook at h1. White kingside is the only castle move available. Half move number is 0. Full move number is 21. White to move.