MESON Chess Problem Database

Problem Display
PID: 210545 (8/7b/1K2P3/RB1kp2Q/p2NN1n1/8/qp5b/3R4 w - - 0 1)

Sparke, Arthur M

The Observer, 1921

(First published on Sun Mar 6 1921)

8/7b/1K2P3/RB1kp2Q/p2NN1n1/8/qp5b/3R4

#2

8 + 8

15239 Valois Notebooks 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Qc4
      • 2.Bc6#
  • Tries
    • 1.Sf5+?
      • 1...Kxe6
        • 2.Bd7#
        • 2.Rd6#
      • 1...Kxe4!
    • 1.Sc6+?
      • 1...Kxe6
        • 2.Rd6#
      • 1...Kxe4!
    • 1.Qe8?
      • threat
        • 2.Qc6#
        • 2.Qa8#
      • 1...Bxe4
        • 2.Qc6#
        • 2.Qd7#
        • 2.Qd8#
      • 1...exd4
        • 2.Bd3#
      • 1...Qc4
        • 2.Bc6#
      • 1...Kxe4!
    • 1.Qxh7?
      • threat
        • 2.Bf1#
        • 2.Be2#
        • 2.Ba6#
        • 2.Qb7#
      • 1...b1Q
        • 2.Qb7#
      • 1...b1R
        • 2.Qb7#
      • 1...Qb3
        • 2.Qb7#
      • 1...Qc4
        • 2.Bc6#
      • 1...Qa3
        • 2.Qb7#
      • 1...exd4!
  • Keys
    • 1.Qf7!
      • threat
        • 2.Qb7#
      • 1...Kxe4
        • 2.Qf3#
      • 1...Bxe4
        • 2.Qd7#
      • 1...exd4
        • 2.Bd3#
      • 1...Qc4
        • 2.Bc6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • Q(a);SBLOCK::R(D)+B(E),DCHECK
  • Tries
    • Try
      • S(B);CHECK,N_PINP(g)
      • Refutation
        • K(f);S_FLIGHT,XS(C)
    • Try
      • S(B);CHECK
      • Vars
        • K(f);N_SPINP(g),OGATE,S_FLIGHT,XP(H)::R1(A)
      • Refutation
        • K(f);N_SPINP(g),S_FLIGHT,XS(C)
    • Try
      • Q(F);N_PINP(g)
      • Threat
        • DUALS(2)
      • Vars
        • P(g);P_SPINP(g),SBLOCK,XS(B)::R(D)+B(E)
        • Q(a);SBLOCK::R(D)+B(E),DCHECK
      • Refutation
        • K(f);S_FLIGHT,XS(C)
    • Try
      • Q(F);N_PINP(g),XB(h)
      • Threat
        • DUALS(4)
      • Vars
        • P(b);P_PINB(E)::QAB(F)
        • Q(a);P_PINB(E)::QAB(F)
        • Q(a);SBLOCK::R(D)+B(E),DCHECK
        • Q(a);::QAB(F)
      • Refutation
        • P(g);P_SPINP(g),XS(B)
  • Actual
    • Q(F);N_PINP(g)
    • Threat
      • QAB(F)
    • Vars
      • K(f);OGATEB,S_FLIGHT,XS(C)::QAB1(F)
      • B(h);SBLOCK,XS(C)::QAR2(F)
      • P(g);P_SPINP(g),SBLOCK,XS(B)::R(D)+B(E)
      • Q(a);SBLOCK::R(D)+B(E),DCHECK
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