[Retros] Die Schwalbe Heft 227

[Joost de Heer]

13513 - Alexander Yarosh
5k2/pppppp2/7P/1P4pK/6PB/5PRs/2P1PRQS/5BSs (14+10)
+---+---+---+---+---+---+---+---+

|   | . |   | . |   |*K |   | . |

+---+---+---+---+---+---+---+---+

|*P |*P |*P |*P |*P |*P | . |   |

+---+---+---+---+---+---+---+---+

|   | . |   | . |   | . |   | P |

+---+---+---+---+---+---+---+---+

| . | P | . |   | . |   |*P | K |

+---+---+---+---+---+---+---+---+

|   | . |   | . |   | . | P | B |

+---+---+---+---+---+---+---+---+

| . |   | . |   | . | P | R |*S |

+---+---+---+---+---+---+---+---+

|   | . | P | . | P | R | Q | S |

+---+---+---+---+---+---+---+---+

| . |   | . |   | . | B | S |*S |

+---+---+---+---+---+---+---+---+
Add 4 pieces, including pieces on g6 and h8, of which one is white. 
Release the position!

13514 - Bernd Schwarzkopf
7B/1p4p1/3p4/8/3PpPP1/PPkrbRP1/B1psPppb/1QK4S (13+12)
+---+---+---+---+---+---+---+---+

|   | . |   | . |   | . |   | B |

+---+---+---+---+---+---+---+---+

| . |*P | . |   | . |   |*P |   |

+---+---+---+---+---+---+---+---+

|   | . |   |*P |   | . |   | . |

+---+---+---+---+---+---+---+---+

| . |   | . |   | . |   | . |   |

+---+---+---+---+---+---+---+---+

|   | . |   | P |*P | P | P | . |

+---+---+---+---+---+---+---+---+

| P | P |*K |*R |*B | R | P |   |

+---+---+---+---+---+---+---+---+

| B | . |*P |*S | P |*P |*P |*B |

+---+---+---+---+---+---+---+---+

| . | Q | K |   | . |   | . | S |

+---+---+---+---+---+---+---+---+
Last 26 moves? Duplex

13515 - Günther Weeth
8/8/1p6/6r1/8/8/4p3/4KBk1 (2+4)
+---+---+---+---+---+---+---+---+

|   | . |   | . |   | . |   | . |

+---+---+---+---+---+---+---+---+

| . |[-]| . |   | . |   | . |   |

+---+---+---+---+---+---+---+---+

|   |*P |   | . |   | . |   | . |

+---+---+---+---+---+---+---+---+

| . |   | . |   | . |   |*R |   |

+---+---+---+---+---+---+---+---+

|   | . |   | . |   | . |   | . |

+---+---+---+---+---+---+---+---+

| . |   | . |   | . |   | . |   |

+---+---+---+---+---+---+---+---+

|   | . |   | . |*P | . |   | . |

+---+---+---+---+---+---+---+---+

| . |   | . |   | K | B |*K |   |

+---+---+---+---+---+---+---+---+
-3 & #1, Proca retractor, Anticirce, Magic square b7

13516 - Günther Weeth
8/8/1p2p1s1/8/8/3p4/3rp3/4KBkb (2+8)
+---+---+---+---+---+---+---+---+

|   | . |   | . |   | . |   | . |

+---+---+---+---+---+---+---+---+

| . |[-]| . |   | . |   | . |   |

+---+---+---+---+---+---+---+---+

|   |*P |   | . |*P | . |*S | . |

+---+---+---+---+---+---+---+---+

| . |   | . |   | . |   | . |   |

+---+---+---+---+---+---+---+---+

|   | . |   | . |   | . |   | . |

+---+---+---+---+---+---+---+---+

| . |   | . |*P | . |   | . |   |

+---+---+---+---+---+---+---+---+

|   | . |   |*R |*P | . |   | . |

+---+---+---+---+---+---+---+---+

| . |   | . |   | K | B |*K |*B |

+---+---+---+---+---+---+---+---+
-4 & #1, Proca retractor, Anticirce, Magic square b7

13517 - Wolfgang Dittmann
8/K1bp4/b2p2p1/P5p1/3Pr1pk/6p1/5Pr1/3s2S1 (5+12)
+---+---+---+---+---+---+---+---+

|   | . |   | . |   | . |   | . |

+---+---+---+---+---+---+---+---+

| K |   |*B |*P | . |   | . |   |

+---+---+---+---+---+---+---+---+

|*B | . |   |*P |   | . |*P | . |

+---+---+---+---+---+---+---+---+

| P |   | . |   | . |   |*P |   |

+---+---+---+---+---+---+---+---+

|   | . |   | P |*R | . |*P |*K |

+---+---+---+---+---+---+---+---+

| . |   | . |   | . |   |*P |   |

+---+---+---+---+---+---+---+---+

|   | . |   | . |   | P |*R | . |

+---+---+---+---+---+---+---+---+

| . |   | . |*S | . |   | S |   |

+---+---+---+---+---+---+---+---+
-5 & #1, Proca retractor, Anticirce Cheylan

13518 - Anatoli Vasilenko, Mark Masistyi
rsbqkbsr/p1B2p2/P7/1p6/5S2/2P1P3/PPP1K1PP/R4BSR (15+11)
+---+---+---+---+---+---+---+---+

|*R |*S |*B |*Q |*K |*B |*S |*R |

+---+---+---+---+---+---+---+---+

|*P |   | B |   | . |*P | . |   |

+---+---+---+---+---+---+---+---+

| P | . |   | . |   | . |   | . |

+---+---+---+---+---+---+---+---+

| . |*P | . |   | . |   | . |   |

+---+---+---+---+---+---+---+---+

|   | . |   | . |   | S |   | . |

+---+---+---+---+---+---+---+---+

| . |   | P |   | P |   | . |   |

+---+---+---+---+---+---+---+---+

| P | P | P | . | K | . | P | P |

+---+---+---+---+---+---+---+---+

| R |   | . |   | . | B | S | R |

+---+---+---+---+---+---+---+---+
Proofgame in 13.5, CoucouCirce

13519 - Henryk Grudzinski
r3kbsr/8/SPPPPPPP/K7/4P3/3p4/PPPP1PPP/RSB2BSR (23+6)
+---+---+---+---+---+---+---+---+

|*R | . |   | . |*K |*B |*S |*R |

+---+---+---+---+---+---+---+---+

| . |   | . |   | . |   | . |   |

+---+---+---+---+---+---+---+---+

| S | P | P | P | P | P | P | P |

+---+---+---+---+---+---+---+---+

| K |   | . |   | . |   | . |   |

+---+---+---+---+---+---+---+---+

|   | . |   | . | P | . |   | . |

+---+---+---+---+---+---+---+---+

| . |   | . |*P | . |   | . |   |

+---+---+---+---+---+---+---+---+

| P | P | P | P |   | P | P | P |

+---+---+---+---+---+---+---+---+

| R | S | B |   | . | B | S | R |

+---+---+---+---+---+---+---+---+
Proofgame in 14.0, Andernach, ParrainCirce

13520 - Hanryk Grudzinski
r1bqkb1r/8/PPPPPPPP/K7/8/4P3/PPPSsPPP/RSB2BSR (23+7)
+---+---+---+---+---+---+---+---+

|*R | . |*B |*Q |*K |*B |   |*R |

+---+---+---+---+---+---+---+---+

| . |   | . |   | . |   | . |   |

+---+---+---+---+---+---+---+---+

| P | P | P | P | P | P | P | P |

+---+---+---+---+---+---+---+---+

| K |   | . |   | . |   | . |   |

+---+---+---+---+---+---+---+---+

|   | . |   | . |   | . |   | . |

+---+---+---+---+---+---+---+---+

| . |   | . |   | P |   | . |   |

+---+---+---+---+---+---+---+---+

| P | P | P | S |*S | P | P | P |

+---+---+---+---+---+---+---+---+

| R | S | B |   | . | B | S | R |

+---+---+---+---+---+---+---+---+
Proofgame in 14.0, Andernach, ParrainCirce, Relay chess

13521 - Werner Datler
8/8/8/8/6Q1/4P3/PPPP1PPP/RSB1KBSR (16+0)
+---+---+---+---+---+---+---+---+

|   | . |   | . |   | . |   | . |

+---+---+---+---+---+---+---+---+

| . |   | . |   | . |   | . |   |

+---+---+---+---+---+---+---+---+

|   | . |   | . |   | . |   | . |

+---+---+---+---+---+---+---+---+

| . |   | . |   | . |   | . |   |

+---+---+---+---+---+---+---+---+

|   | . |   | . |   | . | Q | . |

+---+---+---+---+---+---+---+---+

| . |   | . |   | P |   | . |   |

+---+---+---+---+---+---+---+---+

| P | P | P | P |   | P | P | P |

+---+---+---+---+---+---+---+---+

| R | S | B |   | K | B | S | R |

+---+---+---+---+---+---+---+---+
Proofgame in 21.5, Losing chess

13522 - Anatoli Vasilenko, Andrei Frolkin
1sq2b1r/p1p1p2p/5pp1/6ks/4P3/8/PPPP1PPP/RSB1K1SR (14+12)
+---+---+---+---+---+---+---+---+

|   |*S |*Q | . |   |*B |   |*R |

+---+---+---+---+---+---+---+---+

|*P |   |*P |   |*P |   | . |*P |

+---+---+---+---+---+---+---+---+

|   | . |   | . |   |*P |*P | . |

+---+---+---+---+---+---+---+---+

| . |   | . |   | . |   |*K |*S |

+---+---+---+---+---+---+---+---+

|   | . |   | . | P | . |   | . |

+---+---+---+---+---+---+---+---+

| . |   | . |   | . |   | . |   |

+---+---+---+---+---+---+---+---+

| P | P | P | P |   | P | P | P |

+---+---+---+---+---+---+---+---+

| R | S | B |   | K |   | S | R |

+---+---+---+---+---+---+---+---+
a) Proofgame in 8.0, h#1.5 (0.2;1.1)
b) Proofgame in exactly 8.5, h#1.5 (0.2;1.1)

13523 - Peter Heyl
rsbqkb1Q/ppppp2p/8/5p2/8/s7/PPP1P1PP/2KR1BSR (12+14)
+---+---+---+---+---+---+---+---+

|*R |*S |*B |*Q |*K |*B |   | Q |

+---+---+---+---+---+---+---+---+

|*P |*P |*P |*P |*P |   | . |*P |

+---+---+---+---+---+---+---+---+

|   | . |   | . |   | . |   | . |

+---+---+---+---+---+---+---+---+

| . |   | . |   | . |*P | . |   |

+---+---+---+---+---+---+---+---+

|   | . |   | . |   | . |   | . |

+---+---+---+---+---+---+---+---+

|*S |   | . |   | . |   | . |   |

+---+---+---+---+---+---+---+---+

| P | P | P | . | P | . | P | P |

+---+---+---+---+---+---+---+---+

| . |   | K | R | . | B | S | R |

+---+---+---+---+---+---+---+---+
Proofgame in 8.0

13524 - Valentin Blacker
8/8/8/5P2/5KPs/7p/6PS/5BBk (7+3)
+---+---+---+---+---+---+---+---+

|   | . |   | . |   | . |   | . |

+---+---+---+---+---+---+---+---+

| . |   | . |   | . |   | . |   |

+---+---+---+---+---+---+---+---+

|   | . |   | . |   | . |   | . |

+---+---+---+---+---+---+---+---+

| . |   | . |   | . | P | . |   |

+---+---+---+---+---+---+---+---+

|   | . |   | . |   | K | P |*S |

+---+---+---+---+---+---+---+---+

| . |   | . |   | . |   | . |*P |

+---+---+---+---+---+---+---+---+

|   | . |   | . |   | . | P | S |

+---+---+---+---+---+---+---+---+

| . |   | . |   | . | B | B |*K |

+---+---+---+---+---+---+---+---+
Equal last move?

13525 - Andreas Witt
Construct, using wK, wQ, wP, bK, a position in which white had as many 
last moves as possible.

13526 - Frank Fiedler
How many proofgames exist in which the white king, on h2, is mated by a 
black queen in the fastest possible way?

13527 - Werner Keym
The centers of the squares on which the two kings and two other white 
pieces are standing form (1) a rectangle (2) a square of (a) minimal (b) 
maximal area. In each of these four positions, a #1 is possible. Which 
(most economical) pieces are needed in each case?

Fairy conditions (hopefully I didn't make any errors in the definitions, 
please let me know if one is wrong):

Magic square: A piece whose move ends on this square changes colour. (In 
the retro play this means that white can retract moves with a black 
piece on a magic square, and vice versa)

Anticirce: The capturing piece is reborn on its rebirth square. If the 
rebirth is impossible, the capture is illegal. The captured piece is 
removed. In the standard (Calvet) form, a piece can capture on its 
rebirth square, in the Cheylan form, a piece can't capture on its 
rebirth square.

CoucouCirce: A piece is reborn on the rebirth square of the capturing 
piece. If a pawn is reborn on the promotion rank, it promotes. If the 
rebirth square is occupied, the piece is removed.

Andernach: A capturing piece changes colour.

ParrainCirce: After a capture, a piece is reborn on the next move on the 
square that has the same displacement vector from the capture square as 
the displacement vector of the move that follows it. A pawn reborn on 
the promotion rank promotes. The displacement vector of castling is the 
added displacement vector of the individual king movement and rook movement.

Relay chess: A move must either be made with the same piece that made 
the last move, or with a piece that hasn't moved yet. If there are no 
such pieces, or if none of those pieces can make a legal move, any other 
piece may be chosen.

Losing chess: Kings are non royal. Captures are obligatory.

Solving hints:
- In 13522a, black is mated, in 113522b, white is mated.
- In 13515 and 13516, a black queen appears on b7.
- The main plan in 13517 is taking back h7xTg8=S and forward h8=R#