r1bq1bnr/2pk1p1p/1pn5/p2pp1pN/PP1P2P1/5P1P/R1P1P3/2BQKBNR w K - 3 13
FEN state: r1bq1bnr/2pk1p1p/1pn5/p2pp1pN/PP1P2P1/5P1P/R1P1P3/2BQKBNR w K - 3 13 ; Best move: b4b5
The current state of the chess board is: Black rook at a8, black bishop at c8, black queen at d8, black bishop at f8, black knight at g8 and black rook at h8. Black pawn at c7, black king at d7, black pawn at f7 and black pawn at h7. Black pawn at b6 and black knight at c6. Black pawn at a5, black pawn at d5, black pawn at e5, black pawn at g5 and white knight at h5. White pawn at a4, white pawn at b4, white pawn at d4 and white pawn at g4. White pawn at f3 and white pawn at h3. White rook at a2, white pawn at c2 and white pawn at e2. White bishop at c1, white queen at d1, 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 3. Full move number is 13. White to move.