MESON Chess Problem Database
Problem Display
PID: 209053 (8/5p2/5Pp1/1n4Kp/2p4R/2p1QBBP/1pP1r3/NRbkr3 w - - 0 1)
Penrose, Lionel Sharples
The Observer, 1920
(First published on Sun May 2 1920)
#2
10 + 11
| 15239 | Valois Notebooks | 2020 |
SOLUTION
- SOUND
- Sets
- 1...Rf1
- 2.Bxe2#
- 1...Rg1
- 2.Bxe2#
- 1...Rh1
- 2.Bxe2#
- 1...Sa3
- 2.Rd4#
- 1...Sd4
- 2.Rxd4#
- 1...Sd6
- 2.Rd4#
- 1...Sa7
- 2.Rd4#
- 1...Sc7
- 2.Rd4#
- 1...bxa1Q
- 2.Qxc1#
- 1...bxa1S
- 2.Rxc1#
- 2.Qxc1#
- 1...bxa1B
- 2.Rxc1#
- 2.Qxc1#
- 1...bxa1R
- 2.Qxc1#
- 1...Rf1
- Tries
- 1.Kh6?
- 1...bxa1Q
- 2.Qxc1#
- 1...bxa1S
- 2.Rxc1#
- 2.Qxc1#
- 1...bxa1B
- 2.Rxc1#
- 2.Qxc1#
- 1...bxa1R
- 2.Qxc1#
- 1...Rf1
- 2.Bxe2#
- 1...Rg1
- 2.Bxe2#
- 1...Rh1
- 2.Bxe2#
- 1...Sa3
- 2.Rd4#
- 1...Sd4
- 2.Rxd4#
- 1...Sd6
- 2.Rd4#
- 1...Sa7
- 2.Rd4#
- 1...Sc7
- 2.Rd4#
- 1...g5!
- 1...bxa1Q
- 1.Bxh5?
- 1...bxa1Q
- 2.Qxc1#
- 1...bxa1S
- 2.Rxc1#
- 2.Qxc1#
- 1...bxa1B
- 2.Rxc1#
- 2.Qxc1#
- 1...bxa1R
- 2.Qxc1#
- 1...Rf1
- 2.Bxe2#
- 1...Rg1
- 2.Bxe2#
- 1...Rh1
- 2.Bxe2#
- 1...Sa3
- 2.Rd4#
- 1...Sd4
- 2.Rxd4#
- 1...Sd6
- 2.Rd4#
- 1...Sa7
- 2.Rd4#
- 1...Sc7
- 2.Rd4#
- 1...gxh5!
- 1...bxa1Q
- 1.Bf2?
- 1...bxa1Q
- 2.Qxc1#
- 1...bxa1S
- 2.Rxc1#
- 2.Qxc1#
- 1...bxa1B
- 2.Rxc1#
- 2.Qxc1#
- 1...bxa1R
- 2.Qxc1#
- 1...Rf1
- 2.Bxe2#
- 1...Rh1
- 2.Bxe2#
- 1...Sa3
- 2.Rd4#
- 1...Sd4
- 2.Rxd4#
- 1...Sd6
- 2.Rd4#
- 1...Sa7
- 2.Rd4#
- 1...Sc7
- 2.Rd4#
- 1...Rg1+!
- 1...bxa1Q
- 1.Rxc4?
- 1...bxa1Q
- 2.Qxc1#
- 1...bxa1S
- 2.Rxc1#
- 2.Qxc1#
- 1...bxa1B
- 2.Rxc1#
- 2.Qxc1#
- 1...bxa1R
- 2.Qxc1#
- 1...Rf1
- 2.Bxe2#
- 1...Rg1
- 2.Bxe2#
- 1...Rh1
- 2.Bxe2#
- 1...Sa3
- 2.Rd4#
- 1...Sd4
- 2.Rxd4#
- 1...Sd6
- 2.Rd4#
- 1...Sa7
- 2.Rd4#
- 1...Sc7
- 2.Rd4#
- 1...h4!
- 1...bxa1Q
- 1.Re4?
- 1...bxa1Q
- 2.Qxc1#
- 1...bxa1S
- 2.Rxc1#
- 2.Qxc1#
- 1...bxa1B
- 2.Rxc1#
- 2.Qxc1#
- 1...bxa1R
- 2.Qxc1#
- 1...Rf1
- 2.Bxe2#
- 1...Rg1
- 2.Bxe2#
- 1...Rh1
- 2.Bxe2#
- 1...Sa3
- 2.Rd4#
- 1...Sd4
- 2.Rxd4#
- 1...Sd6
- 2.Rd4#
- 1...Sa7
- 2.Rd4#
- 1...Sc7
- 2.Rd4#
- 1...h4!
- 1...bxa1Q
- 1.Rf4?
- 1...bxa1Q
- 2.Qxc1#
- 1...bxa1S
- 2.Rxc1#
- 2.Qxc1#
- 1...bxa1B
- 2.Rxc1#
- 2.Qxc1#
- 1...bxa1R
- 2.Qxc1#
- 1...Rf1
- 2.Bxe2#
- 2.Qxe2#
- 1...Rg1
- 2.Bxe2#
- 2.Qxe2#
- 1...Rh1
- 2.Bxe2#
- 2.Qxe2#
- 1...Sa3
- 2.Rd4#
- 2.Qd4#
- 1...Sd4
- 2.Rxd4#
- 2.Qxd4#
- 1...Sd6
- 2.Rd4#
- 2.Qd4#
- 1...Sa7
- 2.Rd4#
- 2.Qd4#
- 1...Sc7
- 2.Rd4#
- 2.Qd4#
- 1...h4!
- 1...bxa1Q
- 1.Kh6?
- Keys
- 1.Bf4!
- 1...Rg1+
- 2.Qxg1#
- 1...bxa1Q
- 2.Qxc1#
- 1...bxa1S
- 2.Rxc1#
- 2.Qxc1#
- 1...bxa1B
- 2.Rxc1#
- 2.Qxc1#
- 1...bxa1R
- 2.Qxc1#
- 1...Rf1
- 2.Qxe2#
- 1...Rh1
- 2.Qxe2#
- 1...Sa3
- 2.Qd4#
- 1...Sd4
- 2.Qxd4#
- 1...Sd6
- 2.Qd4#
- 1...Sa7
- 2.Qd4#
- 1...Sc7
- 2.Qd4#
- 1...Rg1+
- 1.Bf4!
FEATURES
- Static
- TYPE = MUTATE
- CHANGED MATES = 8
- ADDED MATES = 0
- REMOVED MATES = 0
- Sets
- R(c);N_GUARD::B(E),XR(e)
- R(c);N_GUARD,P_PINB(F)::B(E),XR(e)
- S(h);N_GUARD::R(H)
- S(h);N_GUARD::R(H),XS(h)
- P(d);N_GUARD,XS(A)::QAR1(D),XB(a)
- Tries
- Try
- K(I);S_FLIGHT
- Vars
- P(d);N_GUARD,XS(A)::QAR1(D),XB(a)
- R(c);N_GUARD::B(E),XR(e)
- S(h);N_GUARD::R(H)
- S(h);N_GUARD::R(H),XS(h)
- Refutation
- P(j);N_PINQ(D)
- Try
- B(E);XP(i)
- Vars
- P(d);N_GUARD,XS(A)::QAR1(D),XB(a)
- R(c);N_GUARD::B(E),XR(e)
- R(c);N_GUARD,P_PINB(F)::B(E),XR(e)
- S(h);N_GUARD::R(H)
- S(h);N_GUARD::R(H),XS(h)
- Refutation
- P(j);N_SPINR(e),XB(E)
- Try
- B(F);
- Vars
- P(d);N_GUARD,XS(A)::QAR1(D),XB(a)
- R(c);N_GUARD::B(E),XR(e)
- S(h);N_GUARD::R(H)
- S(h);N_GUARD::R(H),XS(h)
- Refutation
- R(c);CHECK
- Try
- R(H);XP(g)
- Vars
- P(d);N_GUARD,XS(A)::QAR1(D),XB(a)
- R(c);N_GUARD::B(E),XR(e)
- R(c);N_GUARD,P_PINB(F)::B(E),XR(e)
- S(h);N_GUARD::R(H)
- S(h);N_GUARD::R(H),XS(h)
- Refutation
- P(i);
- Try
- R(H);
- Vars
- P(d);N_GUARD,XS(A)::QAR1(D),XB(a)
- R(c);N_GUARD::B(E),XR(e)
- R(c);N_GUARD,P_PINB(F)::B(E),XR(e)
- S(h);N_GUARD::R(H)
- S(h);N_GUARD::R(H),XS(h)
- Refutation
- P(i);
- Try
- R(H);N_SPINQ(D)
- Vars
- P(d);N_GUARD,XS(A)::QAR1(D),XB(a)
- Refutation
- P(i);
- Try
- Actual
- B(F);N_SPINQ(D)
- Vars
- R(c);CHECK,OGATEB::QAR(D),XR(c)
- P(d);N_GUARD,XS(A)::QAR1(D),XB(a)
- R(c);N_GUARD::QAB1(D),XR(e)
- S(h);N_GUARD::QAR(D)
- S(h);N_GUARD::QAR(D),XS(h)
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