MESON Chess Problem Database
Problem Display
PID: 207895 (8/3pp3/5p2/N1pkPQ2/6N1/2p1Pn2/3r3p/KR1R2nB w - - 0 1)
Sumner, Christopher Richard Benson
The Observer, 1955
(First published on Sun Feb 6 1955)
#2
9 + 10
| 15239 | Valois Notebooks | 2020 |
SOLUTION
- SOUND
- Sets
- 1...Rxd1
- 2.Rxd1#
- 1...Rd3
- 2.Rxd3#
- 1...Rd4
- 2.e4#
- 1...Se2
- 2.Bxf3#
- 1...Sh3
- 2.Bxf3#
- 1...c2
- 2.Rxd2#
- 1...c4
- 2.Rb5#
- 1...fxe5
- 2.Qxe5#
- 1...d6
- 2.e6#
- 1...e6
- 2.Sxf6#
- 1...Rxd1
- Tries
- 1.Rbc1?
- 1...Rxd1
- 2.Rxd1#
- 1...fxe5
- 2.Qxe5#
- 1...e6
- 2.Sxf6#
- 1...Rd3
- 2.Rxd3#
- 1...Rd4
- 2.e4#
- 1...Se2
- 2.Bxf3#
- 1...Sh3
- 2.Bxf3#
- 1...c2
- 2.Rxd2#
- 1...d6
- 2.e6#
- 1...c4!
- 1...Rxd1
- 1.Rb3?
- 1...fxe5
- 2.Qxe5#
- 1...c4
- 2.Rb5#
- 1...e6
- 2.Sxf6#
- 1...Rd3
- 2.Rxd3#
- 1...Rd4
- 2.e4#
- 1...Se2
- 2.Bxf3#
- 1...Sh3
- 2.Bxf3#
- 1...c2
- 2.Rxd2#
- 1...d6
- 2.e6#
- 1...Rxd1+!
- 1...fxe5
- 1.Rb5?
- 1...fxe5
- 2.Qxe5#
- 1...e6
- 2.Sxf6#
- 1...Rd3
- 2.Rxd3#
- 1...Rd4
- 2.Rxd4#
- 2.e4#
- 1...Se2
- 2.Bxf3#
- 1...Sh3
- 2.Bxf3#
- 1...c2
- 2.Rxd2#
- 1...d6
- 2.e6#
- 1...Rxd1+!
- 1...fxe5
- 1.Rb6?
- threat
- 2.e6#
- 1...fxe5
- 2.Qxe5#
- 1...e6
- 2.Sxf6#
- 2.Rd6#
- 1...Rxd1+!
- threat
- 1.Rb7?
- threat
- 2.Rxd7#
- 1...c4
- 2.Rb5#
- 1...d6
- 2.e6#
- 1...Rxd1+!
- threat
- 1.Rb8?
- 1...fxe5
- 2.Qxe5#
- 1...c4
- 2.Rb5#
- 1...e6
- 2.Sxf6#
- 1...Rd3
- 2.Rxd3#
- 1...Rd4
- 2.e4#
- 1...Se2
- 2.Bxf3#
- 1...Sh3
- 2.Bxf3#
- 1...c2
- 2.Rxd2#
- 1...d6
- 2.e6#
- 1...Rxd1+!
- 1...fxe5
- 1.exf6+?
- 1...e5
- 2.Qxe5#
- 1...Kd6!
- 1...e5
- 1.Rbc1?
- Keys
- 1.Sf2!
- 1...Rxd1
- 2.Rxd1#
- 1...fxe5
- 2.Qxd7#
- 1...c4
- 2.Rb5#
- 1...Rd3
- 2.Rxd3#
- 1...Rd4
- 2.e4#
- 1...Se2
- 2.Bxf3#
- 1...Sh3
- 2.Bxf3#
- 1...c2
- 2.Rxd2#
- 1...d6
- 2.e6#
- 1...e6
- 2.Qe4#
- 1...Rxd1
- 1.Sf2!
FEATURES
- Static
- TYPE = MUTATE
- CHANGED MATES = 2
- ADDED MATES = 0
- REMOVED MATES = 0
- Sets
- R(b);N_SPINR(b),OGATE,P_PINR(B),XR(C)::R(B),XR(b)
- R(b);OGATE::R(C),XR(b)
- R(b);::P(E)
- S(a);N_GUARD::B(D),XS(e)
- P(d);N_GUARD::R(C),XR(b)
- P(f);OGATEB::R(B)
- P(h);OGATE,P_SPINP(h),XP(H)::QAR1(I),XP(h)
- P(i);SBLOCK::QAR(I)+P(H)
- P(j);N_GUARD::S(F),XP(h)
- Tries
- Try
- R(B);
- Vars
- R(b);N_SPINR(b),OGATE,P_PINR(B),XR(C)::R(B),XR(b)
- P(h);OGATE,P_SPINP(h),XP(H)::QAR1(I),XP(h)
- P(j);N_GUARD::S(F),XP(h)
- R(b);OGATE::R(C),XR(b)
- R(b);::P(E)
- S(a);N_GUARD::B(D),XS(e)
- P(d);N_GUARD::R(C),XR(b)
- P(i);SBLOCK::QAR(I)+P(H)
- Refutation
- P(f);
- Try
- R(B);
- Vars
- P(h);OGATE,P_SPINP(h),XP(H)::QAR1(I),XP(h)
- P(f);OGATEB::R(B)
- P(j);N_GUARD::S(F),XP(h)
- R(b);OGATE::R(C),XR(b)
- R(b);::P(E)
- S(a);N_GUARD::B(D),XS(e)
- P(d);N_GUARD::R(C),XR(b)
- P(i);SBLOCK::QAR(I)+P(H)
- Refutation
- R(b);CHECK,N_SPINR(b),XR(C)
- Try
- R(B);P_PINP(f)
- Vars
- P(h);OGATE,XP(H)::QAR1(I),XP(h)
- P(j);N_GUARD::S(F),XP(h)
- R(b);OGATE::R(C),XR(b)
- S(a);N_GUARD::B(D),XS(e)
- P(d);N_GUARD::R(C),XR(b)
- P(i);SBLOCK::QAR(I)+P(H)
- Refutation
- R(b);CHECK,N_SPINR(b),XR(C)
- Try
- R(B);
- Threat
- QAR(I)+P(H)
- Vars
- P(h);OGATE,P_SPINP(h),XP(H)::QAR1(I),XP(h)
- Refutation
- R(b);CHECK,N_SPINR(b),XR(C)
- Try
- R(B);
- Threat
- R(B),XP(i)
- Vars
- P(f);OGATEB::R(B)
- P(i);SBLOCK::QAR(I)+P(H)
- Refutation
- R(b);CHECK,N_SPINR(b),XR(C)
- Try
- R(B);
- Vars
- P(h);OGATE,P_SPINP(h),XP(H)::QAR1(I),XP(h)
- P(f);OGATEB::R(B)
- P(j);N_GUARD::S(F),XP(h)
- R(b);OGATE::R(C),XR(b)
- R(b);::P(E)
- S(a);N_GUARD::B(D),XS(e)
- P(d);N_GUARD::R(C),XR(b)
- P(i);SBLOCK::QAR(I)+P(H)
- Refutation
- R(b);CHECK,N_SPINR(b),XR(C)
- Try
- P(H);CHECK,XP(h)
- Vars
- P(j);P_SPINP(j)::QAR1(I),XP(j)
- Refutation
- K(g);N_SPINS(e),P-FLIGHT
- Try
- Actual
- S(F);
- Vars
- R(b);N_SPINR(b),OGATE,P_PINR(B),XR(C)::R(B),XR(b)
- P(h);P_SPINP(h),SBLOCK,XP(H)::QAR2(I),XP(i)
- P(f);OGATEB::R(B)
- R(b);OGATE::R(C),XR(b)
- R(b);::P(E)
- S(a);N_GUARD::B(D),XS(e)
- P(d);N_GUARD::R(C),XR(b)
- P(i);SBLOCK::QAR(I)+P(H)
- P(j);SBLOCK::QAB1(I)
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