# Retro

David113
Posers and Puzzles 09 Jul '08 11:43
1. 09 Jul '08 11:43

What was captured on e5?
2. 09 Jul '08 12:59
Glad to see some retro problems again! I'm no good at them but I'll try: 9 pawn captures were made by white. The a7 pawn made 6 consecutive captures all the way from f2. The bishop got to b8 before the pawn got to a7, which got there before b6 was played. Therefore all this happened before the black light-squared bishop was let out. The b4 pawn comes from a2 (otherwise the white light-squared bishop couldn't have got to b1. Now I don't know what to do.
3. SwissGambit
Caninus Interruptus
09 Jul '08 17:311 edit
Originally posted by Dejection
Glad to see some retro problems again! I'm no good at them but I'll try: 9 pawn captures were made by white. The a7 pawn made 6 consecutive captures all the way from f2. The bishop got to b8 before the pawn got to a7, which got there before b6 was played. Therefore all this happened before the black light-squared bishop was let out. The b4 pawn comes from ...[text shortened]... herwise the white light-squared bishop couldn't have got to b1. Now I don't know what to do.
The first thing to do is re-count: Pf2 to a7 is only 5 captures. There are two more captures (axb and dxc3) for a total of 7. 7 captured + 9 showing = 16, leaving no 'extra' captures.
4. SwissGambit
Caninus Interruptus
09 Jul '08 17:551 edit
Originally posted by SwissGambit
The first thing to do is re-count: Pf2 to a7 is only 5 captures. There are two more captures (axb and dxc3) for a total of 7. 7 captured + 9 showing = 16, leaving no 'extra' captures.
The second thing to do is figure out how to get Bc8 home. Bb1 leaving means b2-b3 and b4-b3 and a2xBb3. I can't do this right away because of a7. Something was captured there, but it was not the a7-pawn, because that shuts wBb8 in. Pa7 couldn't have been captured anywhere else on the a-file, so it promoted.

One try is White retracting d2xQc3 to let the Black a-pawn unpromote. This means killing Bc1 at home, since b2-b3 is White's next retraction. Bb8 is therefore promoted, and it must have been the h-pawn [the only one not accounted for]. Ph5 must make two captures to let it through, but this is a bust - 2 captures needed for the 3 Black pawns, plus one on c1, plus 10 White units showing = 17.

This is fixed by putting the dark-squared Bishop back on the board immediately with ...f6xBe5 [this cannot be done with gxBf6 which shuts in the promoted Bh8]. The solution is that a White Bishop was captured on e5.
5. 09 Jul '08 18:47
Originally posted by SwissGambit
The second thing to do is figure out how to get Bc8 home. Bb1 leaving means b2-b3 and b4-b3 and a2xBb3. I can't do this right away because of a7. Something was captured there, but it was not the a7-pawn, because that shuts wBb8 in. Pa7 couldn't have been captured anywhere else on the a-file, so it promoted.

One try is White retracting d2xQc3 to let th ...[text shortened]... ch shuts in the promoted Bh8]. The solution is that [b]a White Bishop was captured on e5
.[/b]
SOLV'D

composers are J. M. Chorein & M. Caillaud.