problem #1112

[roq]

Solution should go one step further I think since Rxf4+ is only justified by black's next move a4 which is a pawn sac.

[richard]

Hi Roq,

That is an interesting one, I'll have to check the source code to see why the problem generator didn't go further.  My guess is that the evaluation that the promotion was inevitable after the Rook is removed prevented the tactic playing out any further (i.e. the Rook take produced such a large evaluation in favour of black that it was deemed there was no point in playing tha tactic out any further).   Not completely obvious though where the tactic was heading at that point without looking at the computer analysis so I'll see if I can do something better with the problem generator for these types of positions.

Regards,
Richard.