MESON Chess Problem Database
Problem Display
PID: 39561 (4b2b/6kp/6nN/6Q1/7p/p1rR1R1K/n7/B7 w - - 0 1)
Penrose, Lionel Sharples
British Chess Magazine, 1954
#2
6 + 9
| 56 | The Problemist | 1954 |
| 45 | Schach | 2000 |
| 56 | The Problemist | 2001 |
SOLUTION
- SOUND
- Sets
- 1...Ba4
- 2.Rf7#
- 1...Bb5
- 2.Rf7#
- 1...Bc6
- 2.Rf7#
- 1...Bd7+
- 2.Rxd7#
- 1...Bf7
- 2.Rxf7#
- 1...Sc1
- 2.Bxc3#
- 1...Sb4
- 2.Bxc3#
- 1...Ba4
- Tries
- 1.Kh2?
- 1...Bf7
- 2.Rxf7#
- 1...Ba4
- 2.Rf7#
- 1...Bb5
- 2.Rf7#
- 1...Bc6
- 2.Rf7#
- 1...Bd7
- 2.Rxd7#
- 2.Rf7#
- 1...Sc1
- 2.Bxc3#
- 1...Sb4
- 2.Bxc3#
- 1...h3!
- 1...Bf7
- 1.Kg4?
- 1...Bd7+
- 2.Rxd7#
- 1...Bf7
- 2.Rxf7#
- 1...Ba4
- 2.Rf7#
- 1...Bb5
- 2.Rf7#
- 1...Bc6
- 2.Rf7#
- 1...Sc1
- 2.Bxc3#
- 1...Sb4
- 2.Bxc3#
- 1...h3!
- 1...Bd7+
- 1.Bb2?
- 1...Bd7+
- 2.Rxd7#
- 1...Bf7
- 2.Rxf7#
- 1...Ba4
- 2.Rf7#
- 1...Bb5
- 2.Rf7#
- 1...Bc6
- 2.Rf7#
- 1...Sc1
- 2.Bxc3#
- 1...Sb4
- 2.Bxc3#
- 1...axb2!
- 1...Bd7+
- 1.Rxc3?
- threat
- 2.Rc7#
- 1...Sxc3
- 2.Bxc3#
- 1...Bf7
- 2.Rxf7#
- 1...Bc6
- 2.Rf7#
- 1...Bd7+!
- threat
- 1.Rde3?
- 1...Bf7
- 2.Rxf7#
- 1...Ba4
- 2.Re7#
- 2.Rf7#
- 1...Bb5
- 2.Re7#
- 2.Rf7#
- 1...Bc6
- 2.Re7#
- 2.Rf7#
- 1...Sc1
- 2.Bxc3#
- 1...Sb4
- 2.Bxc3#
- 1...Bd7+!
- 1...Bf7
- 1.Rd7+?
- 1...Bf7
- 2.Rxf7#
- 1...Bxd7+!
- 1...Bf7
- 1.Rf1?
- 1...Bf7
- 2.Rxf7#
- 1...Ba4
- 2.Rf7#
- 1...Bb5
- 2.Rf7#
- 1...Bc6
- 2.Rf7#
- 1...Sc1
- 2.Bxc3#
- 1...Sb4
- 2.Bxc3#
- 1...Bd7+!
- 1...Bf7
- 1.Rf2?
- 1...Bf7
- 2.Rxf7#
- 1...Ba4
- 2.Rf7#
- 1...Bb5
- 2.Rf7#
- 1...Bc6
- 2.Rf7#
- 1...Sc1
- 2.Bxc3#
- 1...Sb4
- 2.Bxc3#
- 1...Bd7+!
- 1...Bf7
- 1.Rf4?
- 1...Bf7
- 2.Rxf7#
- 1...Ba4
- 2.Rf7#
- 1...Bb5
- 2.Rf7#
- 1...Bc6
- 2.Rf7#
- 1...Sc1
- 2.Bxc3#
- 1...Sb4
- 2.Bxc3#
- 1...Bd7+!
- 1...Bf7
- 1.Rf5?
- 1...Bf7
- 2.Rxf7#
- 1...Ba4
- 2.Rf7#
- 1...Bb5
- 2.Rf7#
- 1...Bc6
- 2.Rf7#
- 1...Sc1
- 2.Bxc3#
- 1...Sb4
- 2.Bxc3#
- 1...Bd7!
- 1...Bf7
- 1.Kh2?
- Keys
- 1.Rd8!
- 1...Bd7+
- 2.Rxd7#
- 1...Ba4
- 2.Rg8#
- 1...Bb5
- 2.Rg8#
- 1...Bc6
- 2.Rg8#
- 1...Bf7
- 2.Sf5#
- 1...Sc1
- 2.Bxc3#
- 1...Sb4
- 2.Bxc3#
- 1...Bd7+
- 1.Rd8!
FEATURES
- Static
- TYPE = MUTATE
- CHANGED MATES = 4
- ADDED MATES = 0
- REMOVED MATES = 0
- Sets
- B(h);N_GUARD::R1(C)
- B(h);CHECK,N_GUARD::R(B),XB(h)
- B(h);N_GUARD::R1(C),XB(h)
- S(a);N_GUARD::B(A),XR(c)
- Tries
- Try
- K(D);P-FLIGHT
- Vars
- B(h);N_GUARD::R1(C),XB(h)
- B(h);N_GUARD::R1(C)
- S(a);N_GUARD::B(A),XR(c)
- Refutation
- P(d);
- Try
- K(D);S_FLIGHT
- Vars
- B(h);CHECK,N_GUARD::R(B),XB(h)
- B(h);N_GUARD::R1(C),XB(h)
- B(h);N_GUARD::R1(C)
- S(a);N_GUARD::B(A),XR(c)
- Refutation
- P(d);
- Try
- B(A);
- Vars
- B(h);CHECK,N_GUARD::R(B),XB(h)
- B(h);N_GUARD::R1(C),XB(h)
- B(h);N_GUARD::R1(C)
- S(a);N_GUARD::B(A),XR(c)
- Refutation
- P(b);N_SPINR(c),XB(A)
- Try
- R(B);XR(c)
- Threat
- B(A)+R(B),DCHECK
- Vars
- S(a);N_SPINS(e),OGATE,P_SPINS(a),XR(B)::B(A),XS(a)
- B(h);N_GUARD::R1(C),XB(h)
- B(h);N_GUARD::R1(C)
- Refutation
- B(h);CHECK
- Try
- R(B);
- Vars
- B(h);N_GUARD::R1(C),XB(h)
- S(a);N_GUARD::B(A),XR(c)
- Refutation
- B(h);CHECK
- Try
- R(B);CHECK,P_SPINR(C)
- Vars
- B(h);N_GUARD,P_SPINB(h)::R1(B),XB(h)
- Refutation
- B(h);CHECK,XR(B)
- Try
- R(C);P_SPINR(B)
- Vars
- B(h);N_GUARD::R1(C),XB(h)
- B(h);N_GUARD::R1(C)
- S(a);N_GUARD::B(A),XR(c)
- Refutation
- B(h);CHECK
- Try
- R(C);P_SPINR(B)
- Vars
- B(h);N_GUARD::R1(C),XB(h)
- B(h);N_GUARD::R1(C)
- S(a);N_GUARD::B(A),XR(c)
- Refutation
- B(h);CHECK
- Try
- R(C);P_SPINR(B)
- Vars
- B(h);N_GUARD::R1(C),XB(h)
- B(h);N_GUARD::R1(C)
- S(a);N_GUARD::B(A),XR(c)
- Refutation
- B(h);CHECK
- Try
- R(C);P_SPINR(B)
- Vars
- B(h);N_GUARD::R1(C),XB(h)
- B(h);N_GUARD::R1(C)
- S(a);N_GUARD::B(A),XR(c)
- Refutation
- B(h);
- Try
- Actual
- R(B);P_SPINR(C)
- Vars
- B(h);CHECK,N_GUARD::R(B),XB(h)
- B(h);OGATE::R1(B)
- B(h);SBLOCK::S(F)
- S(a);N_GUARD::B(A),XR(c)
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