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Ra7+ then Rb7+ then Ra7+ draw
in 3
1. Rb2 and white cannot avoid mate with Ra7+ in 1-2 moves.
1 Rb2 QB6 (if Qb8, then RxB8#)
2. R2xB6 black moves
3. Ra7#
Checkmate in… let’s count.
1. Ra7+, Kb8 2. Rb1+, Qb6! (Kc8? 3. Ra8+, Kc7 4. Rc1#) 3. Rxb6+, Kc8 4. Rb7!, Kd8 (h1Q? 5. Ra8#) 5. Rxd7+, Ke8 6. Re7+! (6. Rh7/g7?, Ne6!), Kf8 (Kd8? 7. Rb7 8. Ra8#) 7. Rb7, Ne6 8. Ra8+, Nd8 9. Rxd8#
So I’d say with best defense there are 9 moves until mate?
To the anonymous commenter at 8:31,
You are overlooking Qc8 pinning the b7rook.
Jochen is right.
9 moves
Yes, I agree, Jochen’s looks like the correct answer. At least, I haven’t found a flaw in it during the 20 minutes I looked at it.
1 Ra7+ Kb8
2 Rb1+ Kc8
3 Ra8+ Kc7
4 Rc1++
billevans
Anonymus 10.43
2. … Qb6+ and the mate will take a few more moves…