rnb1k1r1/1p1p3p/p2bp1p1/2p2p2/P7/3N3P/1PPPPKP1/R1BQ1B1R w q - 0 20
FEN state: rnb1k1r1/1p1p3p/p2bp1p1/2p2p2/P7/3N3P/1PPPPKP1/R1BQ1B1R w q - 0 20 ; Best move: f2g1
The current state of the chess board is: Black rook at a8, black knight at b8, black bishop at c8, black king at e8 and black rook at g8. Black pawn at b7, black pawn at d7 and black pawn at h7. Black pawn at a6, black bishop at d6, black pawn at e6 and black pawn at g6. Black pawn at c5 and black pawn at f5. White pawn at a4. White knight at d3 and white pawn at h3. White pawn at b2, white pawn at c2, white pawn at d2, white pawn at e2, white king at f2 and white pawn at g2. White rook at a1, white bishop at c1, white queen at d1, white bishop at f1 and white rook at h1. Black queenside is the only castle move available. Half move number is 0. Full move number is 20. White to move.