MESON Chess Problem Database

Problem Display
PID: 162898 (N1b2b2/1pN2Qpn/1RnkP1p1/1p4P1/1p1P4/1K6/8/8 w - - 0 1)

Sumner, Christopher Richard Benson

The Observer, 1925

(First published on Sun Feb 1 1925)

N1b2b2/1pN2Qpn/1RnkP1p1/1p4P1/1p1P4/1K6/8/8

#2

8 + 10

15239 Valois Notebooks 2017

SOLUTION

  • SOUND
  • Sets
    • 1...Bxe6+
      • 2.Qxe6#
    • 1...Bd7
      • 2.Qxd7#
    • 1...Be7
      • 2.Qf4#
    • 1...Sxg5
      • 2.Qxf8#
    • 1...Sf6
      • 2.Qxf8#
  • Tries
    • 1.Ka2?
      • 1...Bxe6+
        • 2.Qxe6#
      • 1...Sxg5
        • 2.Qxf8#
      • 1...Bd7
        • 2.Qxd7#
      • 1...Be7
        • 2.Qf4#
      • 1...Sf6
        • 2.Qxf8#
      • 1...b3+!
    • 1.Kb2?
      • 1...Bxe6
        • 2.Qxe6#
      • 1...Sxg5
        • 2.Qxf8#
      • 1...Bd7
        • 2.Qxd7#
      • 1...Be7
        • 2.Qf4#
      • 1...Sf6
        • 2.Qxf8#
      • 1...b3!
    • 1.Kc2?
      • 1...Bxe6
        • 2.Qxe6#
      • 1...Sxg5
        • 2.Qxf8#
      • 1...Bd7
        • 2.Qxd7#
      • 1...Be7
        • 2.Qf4#
      • 1...Sf6
        • 2.Qxf8#
      • 1...b3+!
    • 1.Qe8?
      • 1...Bxe6+
        • 2.Qxe6#
      • 1...Sxg5
        • 2.Qxf8#
      • 1...Bd7
        • 2.Qxd7#
      • 1...Sf6
        • 2.Qxf8#
      • 1...Be7!
  • Keys
    • 1.e7!
      • threat
        • 2.e8S#
      • 1...Be6+
        • 2.Qxe6#
      • 1...Kd7
        • 2.Qe6#
      • 1...Bxe7
        • 2.Qd5#
      • 1...Bd7
        • 2.Sxb5#
      • 1...Sf6
        • 2.exf8Q#
        • 2.exf8B#

FEATURES

  • Static
    • TYPE = BLOCK_THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 1
    • REMOVED MATES = 2
  • Sets
    • B(i);CHECK,OGATE,XP(E)::QAR1(G),XB(i)
    • B(i);N_GUARD::QAR1(G),XB(i)
    • B(j);SBLOCK::QAB(G)
    • S(h);N_GUARD,XP(C)::QAB(G),XB(j)
    • S(h);N_GUARD::QAB(G),XB(j)
  • Tries
    • Try
      • K(A);S_FLIGHT
      • Vars
        • B(i);CHECK,OGATE,XP(E)::QAR1(G),XB(i)
        • S(h);N_GUARD,XP(C)::QAB(G),XB(j)
        • B(i);N_GUARD::QAR1(G),XB(i)
        • B(j);SBLOCK::QAB(G)
        • S(h);N_GUARD::QAB(G),XB(j)
      • Refutation
        • P(a);CHECK
    • Try
      • K(A);P-FLIGHT
      • Vars
        • B(i);OGATE,XP(E)::QAR1(G),XB(i)
        • S(h);N_GUARD,XP(C)::QAB(G),XB(j)
        • B(i);N_GUARD::QAR1(G),XB(i)
        • B(j);SBLOCK::QAB(G)
        • S(h);N_GUARD::QAB(G),XB(j)
      • Refutation
        • P(a);
    • Try
      • K(A);S_FLIGHT
      • Vars
        • B(i);OGATE,XP(E)::QAR1(G),XB(i)
        • S(h);N_GUARD,XP(C)::QAB(G),XB(j)
        • B(i);N_GUARD::QAR1(G),XB(i)
        • B(j);SBLOCK::QAB(G)
        • S(h);N_GUARD::QAB(G),XB(j)
      • Refutation
        • P(a);CHECK
    • Try
      • Q(G);
      • Vars
        • B(i);CHECK,OGATE,XP(E)::QAR1(G),XB(i)
        • S(h);N_GUARD,XP(C)::QAB(G),XB(j)
        • B(i);N_GUARD::QAR1(G),XB(i)
        • S(h);N_GUARD::QAB(G),XB(j)
      • Refutation
        • B(j);
  • Actual
    • P(E);
    • Threat
      • P=S
    • Vars
      • B(i);CHECK,N_GUARD::QAR1(G),XB(i)
      • K(d);N_SPINS(c),P-FLIGHT::QAB1(G)
      • B(j);SBLOCK,XP(E)::QAR1(G)
      • B(i);SBLOCK::S(F),XP(b)
      • S(h);N_GUARD::PXB(j)=Q
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