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H. G. Muller wrote on Thu, Sep 21, 2023 09:15 AM UTC in reply to Charles Daniel from Mon Oct 22 2007 08:15 PM:

The article mentions the Flying Bomber cannot force checkmate on a bare King. I am not sure this is correct. It is true that a pure Locust (mR[cR-mW]) cannot do it, because it cannot check the corner. But it can check on the edge, (parallel to it), and the D component in the helicopeter move can check the corner. This makes all the difference:

A Bomber confines the bare King just like a Rook would, except that it leaves an escape hole at the board edge. But if the bare King would try to make use of that it would voluntarily have to move towards the edge (the attacking King chasing it to stay close), and would immediately get trapped on that edge rank or file. Like

when it was so foolish to attempt crossing the e-file (sealed by a Bomber at e1) at e8. From here you could get 1... Kd8 2. Fh7 Ke8 3. Fa7 {to get the Bomber on the safe side} Kf8 (3... Ke8? 4. Fa8#) 4. Ke6 Kg8 5. Kf6.

After 5... Kh7 we get 6. Fa8 {covers g8} Kh8 (6... Kh6 7. Fh8#) 7. Fb8 Kh7 8. Ff8 {covers h8 with the D move} Kh6 9. Fh8#. So the escape hole h7 offers no solace, but the alternative (that doesn't get you mated immediately) isn't any better: 5... Kh8 6. Kg6 Kg8 7. Fa8+ Kh8 {with a Rook this would have been checkmate, but now the corner offers shelter} 8. Ff8# {but not for long!}.


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