···2525 return None;
2626 }
2727 let val = col as u8 - b'A';
2828- if col >= 'I' {
2929- Some(val - 1)
3030- } else {
3131- Some(val)
3232- }
2828+ if col >= 'I' { Some(val - 1) } else { Some(val) }
3329 }
34303531 /// Convert a 0-based x coordinate to a GTP column letter.