Mixed Babson task
Most chess problem enthusiasists already heard about famous Babson task - in a problem
four promotions by the same (usually black) are answered by the same four promotions
by other (usually white) pawn. Queen promotion by queen promotion, rook promotion by rook
promotion, etc. Today many problems with Babson task exist, e.g. orthodox #4 - that is very
paradoxical theme for direct moremover! - it was composed after many unsuccessful attempts
of various composers by Leonid Jarosh, many very nice selfmates exist etc.
Various forms of Babson task exist too, for example if fairy pieces are introduced, it can be
extended also to these new pieces. Some fairy forms are very suitable for creating Babson task
problems, Madrasi beeing the best known. Just have a deeper look at
Pat a Mat original by Ladislav Salai jr. with 8 Babson
But this bunch of problems is dedicated to other variation of Babson task. Recently Richard
Stanley asked at retros mailing list about problems featuring so called mixed Babson task, it
shows promotions by one pawn answered by promotions of other pawn, not exactly matched,
but with different pattern. The symbol showing the type of pattern was defined as follows:
if x1 promotion is anwered by x2 promotion, x2 promotion by x3 promotion, ..., xn-1 promotion
by xn promotion and xn promotion by x1 promotion, then we have n in symbol. For all cycles
with lengths n1, n2, ..., ni
we set the symbol (n1+n2+...+ni). For example normal Babson task is then of type (1+1+1+1),
when promotions are matched cyclically (Q-R, R-B, B-S, S-Q), it is of type (4).
Regarding following problems, four were sent to me by Richard Stanley and
3 are incorrect, but I think in any case they may give light to manner of constructing selfmates with
mixed Babson task and possibly encourage composers to try their luck.
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