MESON Chess Problem Database

Problem Display
PID: 199742 (n1QbBBn1/1K1p2r1/2P1kp1R/1R1Np3/2P4N/5b2/8/8 w - - 0 1)

Sumner, Christopher Richard Benson

The Observer, 1946

(First published on Sun Jun 23 1946)

n1QbBBn1/1K1p2r1/2P1kp1R/1R1Np3/2P4N/5b2/8/8

#2

10 + 9

15239 Valois Notebooks 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Rg1
      • 2.Qxd7#
    • 1...Rg2
      • 2.Qxd7#
    • 1...Rg3
      • 2.Qxd7#
    • 1...Rg4
      • 2.Qxd7#
    • 1...Rg5
      • 2.Qxd7#
    • 1...Rg6
      • 2.Qxd7#
    • 1...Bxd5
      • 2.cxd5#
    • 1...Be7
      • 2.Qxd7#
    • 1...Se7
      • 2.Rxf6#
      • 2.Qxd7#
    • 1...e4
      • 2.Sf4#
  • Tries
    • 1.Bxd7+?
      • 1...Rxd7+
        • 2.Qxd7#
      • 1...Kf7!
  • Keys
    • 1.cxd7!
      • threat
        • 2.Qc6#
      • 1...Rxd7+
        • 2.Qxd7#
      • 1...Bxd5+
        • 2.cxd5#
      • 1...Be7
        • 2.d8Q#
        • 2.d8R#
      • 1...Se7
        • 2.Rxf6#
      • 1...e4
        • 2.Sf4#
      • 1...Bc7
        • 2.d8S#
      • 1...Sc7
        • 2.Rb6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 7
  • Sets
    • R(f);N_GUARD::QAB1(H),XP(e)
    • R(f);N_GUARD,N_SPINP(d),P_SPINP(e)::QAB1(H),XP(e)
    • B(a);OGATE,P_PINP(E),XS(D)::P(A),XB(a)
    • B(h);S_CUTR(f)::QAB1(H),XP(e)
    • P(b);N_GUARD::S(D)
  • Tries
    • Try
      • B(I);CHECK,P_SPINB(I),XP(e)
      • Vars
        • R(f);CHECK,OGATE,P_SPINR(f),XB(I)::QAB1(H),XR(f)
      • Refutation
        • K(c);N_PINB(I),N_SPINP(d),S_FLIGHT
  • Actual
    • P(E);P_SPINP(E),P_SPINS(D),XP(e)
    • Threat
      • QAR2(H)
    • Vars
      • R(f);CHECK,OGATE,P_SPINR(f),XP(E)::QAB1(H),XR(f)
      • B(a);CHECK,OGATE,XS(D)::P(A),XB(a)
      • B(h);N_PINP(E)::P=Q
      • S(i);N_GUARD,N_PINP(E),S_CUTB(h)::R1(F),XP(d)
      • P(b);N_PINS(D)::S(D)
      • B(h);N_PINP(E)::P=S
      • S(g);N_GUARD,N_PINP(E),S_CUTB(h)::R(C)
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