[Retros] solving retros in Ecully (RIFACE 2018) : the problems

[CAILLAUD Michel]

Hello,

Below are the 10 problems (originals for Phénix 2018) submitted to 12
solvers on sunday morning (20th of may).for the "French Retro Solving
Championship".
Solving time : 2h30'
Enjoy!

Best,
Michel

1.

r3k2r/1pppppp1/3P4/4R3/4Q3/2pKPp2/1P1PP1P1/3B4

2# (10+11)

b) wBd1 to e1

2.

3q2br/p1pppp1r/1p3p2/2P5/P5PP/1kPP4/1Pp1P3/K2B4

Last 11 single moves ? (10+13)

3.

k7/PR1p1ppp/8/8/8/8/1PPPP1b1/2K4R

-2 & 1# Proca-Retractor (8+6)

(Proca-Retractor : retractor of the defensive type ; both side retract
their move alternatively, with White starting. Retracting side decides the
type of uncaptured piece, in case of uncapture. After retracting, both side
can give mate in one move, if possible).

4.

rn3bnr/ppp1p1pp/4k3/4Pp2/4K1b1/8/PPPq1PPP/RNBQ2NR

SPG 7,0 (14+15)

2 solutions

(=2 variations after White's 1st move)

5.

rnb1kbnr/2pppppp/8/8/8/8/PPPP1PPP/RNBQK1N1

SPG 8,5 (13+13)

6.

1nbqkbnr/p1pppppp/8/8/8/8/P1P1PPPP/RNBQK1N1

SPG 10,5 (12+14)

7.

r1b3nr/1p3ppp/8/4p3/1b6/k7/PNPPPPPP/RNBQKBNR

SPG 10,5 (16+11)

8.

3qR1n1/p3npp1/2r3p1/1kp5/bp1b3P/1r6/PPPPP1P1/RNBQKB2

SPG 17,5 (14+14)

9.

6Br/p1p4b/2p1p1p1/rp2bpqk/4n3/8/PPPPPP1P/RNBQK1NR

SPG 19,5 (15+14)

10.

rnb1kbnr/pp1p1ppp/2q1p3/2p1Q3/5P1P/3P4/PPP1P1PR/RNB1KBN1

SPG 8,5 (16+16)

Schlagzwang : if they can, Black must capture
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