XGID=-aBCCBB------Ab---Bcdd--a-:1:-1:1:61:0:0:3:0:10
Money Play. How should Red play 61?
The play to avoid here is 13/6. That cedes the outer boards to White who can then run out with impunity with any six and get into an even race.
Red must cover those outer boards. 18/17,18/12 is the best move but it is virtually tied with 18/11. One move duplicates White’s threes and the other his fours. 18/12, 3/2 is also OK.