MESON Chess Problem Database
Problem Display
PID: 11285 (8/8/4BK2/n7/3Qp3/2R1PpB1/pr2k1n1/b2R4 w - - 0 1)
Penrose, Lionel Sharples
Southend Times, 1937
#2
7 + 8
SOLUTION
- SOUND
- Sets
- 1...Rb1
- 2.Rc2#
- 2.Qd2#
- 1...Rc2
- 2.Rxc2#
- 1...Rd2
- 2.Qxd2#
- 1...Rb3
- 2.Rc2#
- 2.Qd2#
- 1...Rb4
- 2.Rc2#
- 2.Qd2#
- 1...Rb5
- 2.Rc2#
- 2.Qd2#
- 1...Rb6
- 2.Rc2#
- 2.Qd2#
- 1...Rb7
- 2.Rc2#
- 2.Qd2#
- 1...Rb8
- 2.Rc2#
- 2.Qd2#
- 1...Se1
- 2.Rxe1#
- 1...Sxe3
- 2.Re1#
- 2.Rxe3#
- 1...Sf4
- 2.Re1#
- 1...Sh4
- 2.Re1#
- 1...Sb3
- 2.Bc4#
- 1...Sc4
- 2.Bxc4#
- 1...Sc6
- 2.Bc4#
- 1...Sb7
- 2.Bc4#
- 1...f2
- 2.Bg4#
- 1...Rb1
- Tries
- 1.Kg5?
- 1...Sxe3
- 2.Re1#
- 2.Rxe3#
- 1...Rd2
- 2.Qxd2#
- 1...Se1
- 2.Rxe1#
- 1...f2
- 2.Bg4#
- 1...Rb1
- 2.Rc2#
- 2.Qd2#
- 1...Rc2
- 2.Rxc2#
- 1...Rb3
- 2.Rc2#
- 2.Qd2#
- 1...Rb4
- 2.Rc2#
- 2.Qd2#
- 1...Rb6
- 2.Rc2#
- 2.Qd2#
- 1...Rb7
- 2.Rc2#
- 2.Qd2#
- 1...Rb8
- 2.Rc2#
- 2.Qd2#
- 1...Sf4
- 2.Re1#
- 1...Sh4
- 2.Re1#
- 1...Sb3
- 2.Bc4#
- 1...Sc4
- 2.Bxc4#
- 1...Sc6
- 2.Bc4#
- 1...Sb7
- 2.Bc4#
- 1...Rb5+!
- 1...Sxe3
- 1.Kf7?
- 1...Sxe3
- 2.Re1#
- 2.Rxe3#
- 1...Rd2
- 2.Qxd2#
- 1...Se1
- 2.Rxe1#
- 1...f2
- 2.Bg4#
- 1...Rb1
- 2.Rc2#
- 2.Qd2#
- 1...Rc2
- 2.Rxc2#
- 1...Rb3
- 2.Rc2#
- 2.Qd2#
- 1...Rb4
- 2.Rc2#
- 2.Qd2#
- 1...Rb5
- 2.Rc2#
- 2.Qd2#
- 1...Rb6
- 2.Rc2#
- 2.Qd2#
- 1...Rb8
- 2.Rc2#
- 2.Qd2#
- 1...Sf4
- 2.Re1#
- 1...Sh4
- 2.Re1#
- 1...Sb3
- 2.Bc4#
- 1...Sc4
- 2.Bxc4#
- 1...Sc6
- 2.Bc4#
- 1...Sb7
- 2.Bc4#
- 1...Rb7+!
- 1...Sxe3
- 1.Kg7?
- 1...Sxe3
- 2.Re1#
- 2.Rxe3#
- 1...Rd2
- 2.Qxd2#
- 1...Se1
- 2.Rxe1#
- 1...f2
- 2.Bg4#
- 1...Rb1
- 2.Rc2#
- 2.Qd2#
- 1...Rc2
- 2.Rxc2#
- 1...Rb3
- 2.Rc2#
- 2.Qd2#
- 1...Rb4
- 2.Rc2#
- 2.Qd2#
- 1...Rb5
- 2.Rc2#
- 2.Qd2#
- 1...Rb6
- 2.Rc2#
- 2.Qd2#
- 1...Rb8
- 2.Rc2#
- 2.Qd2#
- 1...Sf4
- 2.Re1#
- 1...Sh4
- 2.Re1#
- 1...Sb3
- 2.Bc4#
- 1...Sc4
- 2.Bxc4#
- 1...Sc6
- 2.Bc4#
- 1...Sb7
- 2.Bc4#
- 1...Rb7+!
- 1...Sxe3
- 1.Bh4?
- 1...Sxe3
- 2.Re1#
- 2.Rxe3#
- 1...Rd2
- 2.Qxd2#
- 1...Se1
- 2.Rxe1#
- 1...f2
- 2.Bg4#
- 1...Rb1
- 2.Rc2#
- 2.Qd2#
- 1...Rc2
- 2.Rxc2#
- 1...Rb3
- 2.Rc2#
- 2.Qd2#
- 1...Rb4
- 2.Rc2#
- 2.Qd2#
- 1...Rb5
- 2.Rc2#
- 2.Qd2#
- 1...Rb6
- 2.Rc2#
- 2.Qd2#
- 1...Rb7
- 2.Rc2#
- 2.Qd2#
- 1...Rb8
- 2.Rc2#
- 2.Qd2#
- 1...Sf4
- 2.Re1#
- 1...Sb3
- 2.Bc4#
- 1...Sc4
- 2.Bxc4#
- 1...Sc6
- 2.Bc4#
- 1...Sb7
- 2.Bc4#
- 1...Sxh4!
- 1...Sxe3
- 1.Bf7?
- 1...Sxe3
- 2.Re1#
- 2.Rxe3#
- 1...Rd2
- 2.Qxd2#
- 1...Se1
- 2.Rxe1#
- 1...f2
- 2.Bh5#
- 1...Sb3
- 2.Bc4#
- 1...Rb1
- 2.Rc2#
- 2.Qd2#
- 1...Rc2
- 2.Rxc2#
- 1...Rb3
- 2.Rc2#
- 2.Qd2#
- 1...Rb4
- 2.Rc2#
- 2.Qd2#
- 1...Rb5
- 2.Rc2#
- 2.Qd2#
- 1...Rb7
- 2.Rc2#
- 2.Qd2#
- 1...Rb8
- 2.Rc2#
- 2.Qd2#
- 1...Sf4
- 2.Re1#
- 1...Sh4
- 2.Re1#
- 1...Sc4
- 2.Bxc4#
- 1...Sc6
- 2.Bc4#
- 1...Sb7
- 2.Bc4#
- 1...Rb6+!
- 1...Sxe3
- 1.Rdc1?
- threat
- 2.Qd1#
- 1...Sxe3
- 2.Re1#
- 2.Rxe3#
- 2.Qxe3#
- 1...Se1
- 2.Rxe1#
- 1...Rd2!
- threat
- 1.Rg1?
- threat
- 2.Qd1#
- 1...Sxe3
- 2.Re1#
- 2.Rxe3#
- 2.Qxe3#
- 1...Rb1
- 2.Rc2#
- 1...Se1
- 2.Rxe1#
- 1...Rd2!
- threat
- 1.Rh1?
- threat
- 2.Qd1#
- 1...Sxe3
- 2.Re1#
- 2.Rxe3#
- 2.Qxe3#
- 1...Rb1
- 2.Rc2#
- 1...Se1
- 2.Rxe1#
- 1...Rd2!
- threat
- 1.Rc5?
- 1...Sxe3
- 2.Re1#
- 1...Se1
- 2.Rxe1#
- 1...f2
- 2.Bg4#
- 1...Sb3
- 2.Bc4#
- 1...Rb1
- 2.Rc2#
- 1...Rc2
- 2.Rxc2#
- 1...Rb3
- 2.Rc2#
- 1...Rb4
- 2.Rc2#
- 1...Rb5
- 2.Rc2#
- 1...Rb6
- 2.Rc2#
- 1...Rb7
- 2.Rc2#
- 1...Rb8
- 2.Rc2#
- 1...Sf4
- 2.Re1#
- 1...Sh4
- 2.Re1#
- 1...Sc4
- 2.Bxc4#
- 1...Sc6
- 2.Bc4#
- 1...Sb7
- 2.Bc4#
- 1...Rd2!
- 1...Sxe3
- 1.Rc6?
- 1...Sxe3
- 2.Re1#
- 1...Sxc6
- 2.Bc4#
- 1...Se1
- 2.Rxe1#
- 1...f2
- 2.Bg4#
- 1...Sb3
- 2.Bc4#
- 1...Rb1
- 2.Rc2#
- 1...Rc2
- 2.Rxc2#
- 1...Rb3
- 2.Rc2#
- 1...Rb4
- 2.Rc2#
- 1...Rb5
- 2.Rc2#
- 1...Rb6
- 2.Rc2#
- 1...Rb7
- 2.Rc2#
- 1...Rb8
- 2.Rc2#
- 1...Sf4
- 2.Re1#
- 1...Sh4
- 2.Re1#
- 1...Sc4
- 2.Bxc4#
- 1...Sb7
- 2.Bc4#
- 1...Rd2!
- 1...Sxe3
- 1.Rc7?
- 1...Sxe3
- 2.Re1#
- 1...Se1
- 2.Rxe1#
- 1...f2
- 2.Bg4#
- 1...Sb3
- 2.Bc4#
- 1...Rb1
- 2.Rc2#
- 1...Rc2
- 2.Rxc2#
- 1...Rb3
- 2.Rc2#
- 1...Rb4
- 2.Rc2#
- 1...Rb5
- 2.Rc2#
- 1...Rb6
- 2.Rc2#
- 1...Rb7
- 2.Rc2#
- 1...Rb8
- 2.Rc2#
- 1...Sf4
- 2.Re1#
- 1...Sh4
- 2.Re1#
- 1...Sc4
- 2.Bxc4#
- 1...Sc6
- 2.Bc4#
- 1...Sb7
- 2.Bc4#
- 1...Rd2!
- 1...Sxe3
- 1.Rc8?
- 1...Sxe3
- 2.Re1#
- 1...Se1
- 2.Rxe1#
- 1...f2
- 2.Bg4#
- 1...Sb3
- 2.Bc4#
- 1...Rb1
- 2.Rc2#
- 1...Rc2
- 2.Rxc2#
- 1...Rb3
- 2.Rc2#
- 1...Rb4
- 2.Rc2#
- 1...Rb5
- 2.Rc2#
- 1...Rb6
- 2.Rc2#
- 1...Rb7
- 2.Rc2#
- 1...Rb8
- 2.Rc2#
- 1...Sf4
- 2.Re1#
- 1...Sh4
- 2.Re1#
- 1...Sc4
- 2.Bxc4#
- 1...Sc6
- 2.Bc4#
- 1...Sb7
- 2.Bc4#
- 1...Rd2!
- 1...Sxe3
- 1.Qd6?
- 1...Sxe3
- 2.Re1#
- 1...Rd2
- 2.Qxd2#
- 1...Se1
- 2.Rxe1#
- 1...f2
- 2.Bg4#
- 1...Sb3
- 2.Bc4#
- 1...Rb1
- 2.Qd2#
- 1...Rb3
- 2.Qd2#
- 1...Rb4
- 2.Qd2#
- 1...Rb5
- 2.Qd2#
- 1...Rb6
- 2.Qd2#
- 1...Rb7
- 2.Qd2#
- 1...Rb8
- 2.Qd2#
- 1...Sf4
- 2.Re1#
- 1...Sh4
- 2.Re1#
- 1...Sc4
- 2.Bxc4#
- 1...Sc6
- 2.Bc4#
- 1...Sb7
- 2.Bc4#
- 1...Rc2!
- 1...Sxe3
- 1.Qd7?
- 1...Sxe3
- 2.Re1#
- 1...Rd2
- 2.Qxd2#
- 1...Se1
- 2.Rxe1#
- 1...f2
- 2.Bg4#
- 1...Sb3
- 2.Bc4#
- 1...Rb1
- 2.Qd2#
- 1...Rb3
- 2.Qd2#
- 1...Rb4
- 2.Qd2#
- 1...Rb5
- 2.Qd2#
- 1...Rb6
- 2.Qd2#
- 1...Rb7
- 2.Qd2#
- 1...Rb8
- 2.Qd2#
- 1...Sf4
- 2.Re1#
- 1...Sh4
- 2.Re1#
- 1...Sc4
- 2.Bxc4#
- 1...Sc6
- 2.Bc4#
- 1...Sb7
- 2.Bc4#
- 1...Rc2!
- 1...Sxe3
- 1.Qd8?
- 1...Sxe3
- 2.Re1#
- 1...Rd2
- 2.Qxd2#
- 1...Se1
- 2.Rxe1#
- 1...f2
- 2.Bg4#
- 1...Sb3
- 2.Bc4#
- 1...Rb1
- 2.Qd2#
- 1...Rb3
- 2.Qd2#
- 1...Rb4
- 2.Qd2#
- 1...Rb5
- 2.Qd2#
- 1...Rb6
- 2.Qd2#
- 1...Rb7
- 2.Qd2#
- 1...Rb8
- 2.Qd2#
- 1...Sf4
- 2.Re1#
- 1...Sh4
- 2.Re1#
- 1...Sc4
- 2.Bxc4#
- 1...Sc6
- 2.Bc4#
- 1...Sb7
- 2.Bc4#
- 1...Rc2!
- 1...Sxe3
- 1.Kg5?
- Keys
- 1.Rcc1!
- 1...Sxe3
- 2.Re1#
- 1...Se1
- 2.Rxe1#
- 1...f2
- 2.Bg4#
- 1...Rd2
- 2.Rxd2#
- 1...Rb1
- 2.Rc2#
- 2.Rd2#
- 1...Rc2
- 2.Rxc2#
- 1...Rb3
- 2.Rc2#
- 2.Rd2#
- 1...Rb4
- 2.Rc2#
- 2.Rd2#
- 1...Rb5
- 2.Rc2#
- 2.Rd2#
- 1...Rb6
- 2.Rc2#
- 2.Rd2#
- 1...Rb7
- 2.Rc2#
- 2.Rd2#
- 1...Rb8
- 2.Rc2#
- 2.Rd2#
- 1...Sf4
- 2.Re1#
- 1...Sh4
- 2.Re1#
- 1...Sb3
- 2.Bc4#
- 1...Sc4
- 2.Bxc4#
- 1...Sc6
- 2.Bc4#
- 1...Sb7
- 2.Bc4#
- 1...Sxe3
- 1.Rcc1!
FEATURES
- Static
- TYPE = MUTATE
- CHANGED MATES = 1
- ADDED MATES = 1
- REMOVED MATES = 0
- Sets
- R(c);N_GUARD::R(B),XR(c)
- R(c);N_GUARD::QAR1(E),XR(c)
- S(e);N_GUARD::R1(A),XS(e)
- S(e);N_GUARD::R1(A)
- S(h);N_GUARD::B(F)
- S(h);N_GUARD::B(F),XS(h)
- P(f);OGATEB::B(F)
- Tries
- Try
- K(G);S_FLIGHT
- Vars
- R(c);N_GUARD::QAR1(E),XR(c)
- S(e);N_GUARD::R1(A),XS(e)
- P(f);OGATEB::B(F)
- R(c);N_GUARD::R(B),XR(c)
- S(e);N_GUARD::R1(A)
- S(h);N_GUARD::B(F)
- S(h);N_GUARD::B(F),XS(h)
- Refutation
- R(c);CHECK
- Try
- K(G);P-FLIGHT
- Vars
- R(c);N_GUARD::QAR1(E),XR(c)
- S(e);N_GUARD::R1(A),XS(e)
- P(f);OGATEB::B(F)
- R(c);N_GUARD::R(B),XR(c)
- S(e);N_GUARD::R1(A)
- S(h);N_GUARD::B(F)
- S(h);N_GUARD::B(F),XS(h)
- Refutation
- R(c);CHECK
- Try
- K(G);S_FLIGHT
- Vars
- R(c);N_GUARD::QAR1(E),XR(c)
- S(e);N_GUARD::R1(A),XS(e)
- P(f);OGATEB::B(F)
- R(c);N_GUARD::R(B),XR(c)
- S(e);N_GUARD::R1(A)
- S(h);N_GUARD::B(F)
- S(h);N_GUARD::B(F),XS(h)
- Refutation
- R(c);CHECK
- Try
- B(D);
- Vars
- R(c);N_GUARD::QAR1(E),XR(c)
- S(e);N_GUARD::R1(A),XS(e)
- P(f);OGATEB::B(F)
- R(c);N_GUARD::R(B),XR(c)
- S(e);N_GUARD::R1(A)
- S(h);N_GUARD::B(F)
- S(h);N_GUARD::B(F),XS(h)
- Refutation
- S(e);XB(D)
- Try
- B(F);
- Vars
- R(c);N_GUARD::QAR1(E),XR(c)
- S(e);N_GUARD::R1(A),XS(e)
- P(f);OGATEB::B(F)
- S(h);N_GUARD::B(F)
- R(c);N_GUARD::R(B),XR(c)
- S(e);N_GUARD::R1(A)
- S(h);N_GUARD::B(F),XS(h)
- Refutation
- R(c);CHECK
- Try
- R(A);
- Threat
- QAB1(E)
- Vars
- S(e);N_GUARD::R1(A),XS(e)
- Refutation
- R(c);
- Try
- R(A);
- Threat
- QAB1(E)
- Vars
- R(c);N_GUARD::R(B)
- S(e);N_GUARD::R1(A),XS(e)
- Refutation
- R(c);
- Try
- R(A);
- Threat
- QAB1(E)
- Vars
- R(c);N_GUARD::R(B)
- S(e);N_GUARD::R1(A),XS(e)
- Refutation
- R(c);
- Try
- R(B);
- Vars
- S(e);N_GUARD,XP(C)::R1(A)
- S(e);N_GUARD::R1(A),XS(e)
- P(f);OGATEB::B(F)
- S(h);N_GUARD::B(F)
- R(c);N_GUARD,P_PINQ(E)::R(B)
- R(c);N_GUARD,P_PINQ(E)::R(B),XR(c)
- R(c);N_GUARD,P_PINB(F),P_PINQ(E)::R(B)
- S(e);N_GUARD::R1(A)
- S(h);N_GUARD::B(F),XS(h)
- Refutation
- R(c);P_PINQ(E)
- Try
- R(B);
- Vars
- S(e);N_GUARD,XP(C)::R1(A)
- S(h);N_GUARD,XR(B)::B(F)
- S(e);N_GUARD::R1(A),XS(e)
- P(f);OGATEB::B(F)
- S(h);N_GUARD::B(F)
- R(c);N_GUARD,P_PINQ(E)::R(B)
- R(c);N_GUARD,P_PINQ(E)::R(B),XR(c)
- S(e);N_GUARD::R1(A)
- S(h);N_GUARD::B(F),XS(h)
- Refutation
- R(c);P_PINQ(E)
- Try
- R(B);
- Vars
- S(e);N_GUARD,XP(C)::R1(A)
- S(e);N_GUARD::R1(A),XS(e)
- P(f);OGATEB::B(F)
- S(h);N_GUARD::B(F)
- R(c);N_GUARD,P_PINQ(E)::R(B)
- R(c);N_GUARD,P_PINQ(E)::R(B),XR(c)
- R(c);N_GUARD,P_PINB(F),P_PINQ(E)::R(B)
- S(e);N_GUARD::R1(A)
- S(h);N_GUARD::B(F),XS(h)
- Refutation
- R(c);P_PINQ(E)
- Try
- R(B);
- Vars
- S(e);N_GUARD,XP(C)::R1(A)
- S(e);N_GUARD::R1(A),XS(e)
- P(f);OGATEB::B(F)
- S(h);N_GUARD::B(F)
- R(c);N_GUARD,P_PINQ(E)::R(B)
- R(c);N_GUARD,P_PINQ(E)::R(B),XR(c)
- R(c);N_GUARD,P_PINB(F),P_PINQ(E)::R(B)
- S(e);N_GUARD::R1(A)
- S(h);N_GUARD::B(F),XS(h)
- Refutation
- R(c);P_PINQ(E)
- Try
- Q(E);
- Vars
- S(e);N_GUARD,XP(C)::R1(A)
- R(c);N_GUARD,P_PINR(B)::QAR1(E),XR(c)
- S(e);N_GUARD::R1(A),XS(e)
- P(f);OGATEB::B(F)
- S(h);N_GUARD::B(F)
- R(c);N_GUARD,P_PINR(B)::QAR1(E)
- S(e);N_GUARD::R1(A)
- S(h);N_GUARD::B(F),XS(h)
- Refutation
- R(c);P_PINR(B)
- Try
- Q(E);
- Vars
- S(e);N_GUARD,XP(C)::R1(A)
- R(c);N_GUARD,P_PINR(B)::QAR1(E),XR(c)
- S(e);N_GUARD::R1(A),XS(e)
- P(f);OGATEB::B(F)
- S(h);N_GUARD::B(F)
- R(c);N_GUARD,P_PINR(B)::QAR1(E)
- R(c);N_GUARD,P_PINB(F),P_PINR(B)::QAR1(E)
- S(e);N_GUARD::R1(A)
- S(h);N_GUARD::B(F),XS(h)
- Refutation
- R(c);P_PINR(B)
- Try
- Q(E);
- Vars
- S(e);N_GUARD,XP(C)::R1(A)
- R(c);N_GUARD,P_PINR(B)::QAR1(E),XR(c)
- S(e);N_GUARD::R1(A),XS(e)
- P(f);OGATEB::B(F)
- S(h);N_GUARD::B(F)
- R(c);N_GUARD,P_PINR(B)::QAR1(E)
- R(c);N_GUARD,P_PINB(F),P_PINR(B)::QAR1(E)
- S(e);N_GUARD::R1(A)
- S(h);N_GUARD::B(F),XS(h)
- Refutation
- R(c);P_PINR(B)
- Try
- Actual
- R(B);
- Vars
- S(e);N_GUARD,XP(C)::R1(A)
- S(e);N_GUARD::R1(A),XS(e)
- P(f);OGATEB::B(F)
- R(c);N_GUARD,P_PINQ(E)::R1(A),XR(c)
- R(c);N_GUARD,P_PINQ(E)::R(B),XR(c)
- S(e);N_GUARD::R1(A)
- S(h);N_GUARD::B(F)
- S(h);N_GUARD::B(F),XS(h)
Developed and maintained by Brian Stephenson.
Implemented with HTML5, MySQL, Perl (with, inter alia, CGI::Simple, HTML::Template & XML::LibXML) &
CSS/Javascript (jQuery, Bootstrap & DataTables).