MESON Chess Problem Database

Problem Display
PID: 164146 (K1b1Q3/1n5R/2Bk4/3N4/p2P2p1/8/8/2q5 w - - 0 1)

Holroyd, GC

The Observer, 1926

(First published on Sun Feb 21 1926)

K1b1Q3/1n5R/2Bk4/3N4/p2P2p1/8/8/2q5

#2

6 + 6

15239 Valois Notebooks 2017

SOLUTION

  • SOUND
  • Sets
    • 1...Qxc6
      • 2.Qe5#
    • 1...Bd7
      • 2.Qxd7#
  • Tries
    • 1.Bb5?
      • threat
        • 2.Qe5#
      • 1...Kxd5
        • 2.Qe5#
      • 1...Qe3
        • 2.Qc6#
      • 1...Qf4
        • 2.Qc6#
      • 1...Qg5
        • 2.Qc6#
      • 1...Qe1
        • 2.Qc6#
      • 1...Be6!
    • 1.Bxb7?
      • threat
        • 2.Qe5#
        • 2.Qe7#
      • 1...Qc6
        • 2.Qxc6#
        • 2.Qe5#
      • 1...Qe3
        • 2.Qc6#
      • 1...Qf4
        • 2.Qc6#
        • 2.Qe7#
      • 1...Qg5
        • 2.Qc6#
      • 1...Qe1
        • 2.Qc6#
      • 1...Qc7
        • 2.Qe5#
      • 1...Be6
        • 2.Qe7#
        • 2.Qf8#
      • 1...Bxb7+!
    • 1.Rh6+?
      • 1...Be6
        • 2.Rxe6#
        • 2.Qd7#
        • 2.Qxe6#
      • 1...Qxh6!
    • 1.Rd7+?
      • 1...Bxd7
        • 2.Qxd7#
      • 1...Kxc6!
    • 1.Qf8+?
      • 1...Ke6
        • 2.Sc7#
        • 2.Qf6#
      • 1...Kxc6!
  • Keys
    • 1.Se7!
      • threat
        • 2.Sxc8#
      • 1...Ke6
        • 2.Qg6#
      • 1...Kc7
        • 2.Sxc8#
      • 1...Qxc6
        • 2.Qxc6#
      • 1...Bf5
        • 2.Sxf5#
      • 1...Be6
        • 2.Qb8#
      • 1...Bd7
        • 2.Qxd7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • Q(a);SBLOCK,XB(C)::QAB1(F)
    • B(f);N_GUARD::QAR1(F),XB(f)
  • Tries
    • Try
      • B(C);
      • Threat
        • QAB1(F)
      • Vars
        • K(d);P-FLIGHT,XS(B)::QAR1(F)
        • Q(a);N_GUARD::QAR1(F)
      • Refutation
        • B(f);
    • Try
      • B(C);XS(e)
      • Threat
        • DUALS(2)
      • Vars
        • Q(a);N_GUARD::QAR1(F)
        • Q(a);::QAB1(F)
      • Refutation
        • B(f);CHECK,XB(C)
    • Try
      • R(D);CHECK
      • Refutation
        • Q(a);XR(D)
    • Try
      • R(D);CHECK
      • Vars
        • B(f);OGATE,XR(D)::QAR1(F),XB(f)
      • Refutation
        • K(d);P-FLIGHT,XB(C)
    • Try
      • Q(F);CHECK
      • Refutation
        • K(d);P-FLIGHT,XB(C)
  • Actual
    • S(B);
    • Threat
      • S(B),XB(f)
    • Vars
      • K(d);P-FLIGHT::QAR2(F)
      • K(d);S_FLIGHT::R(D)+S(B),XB(f)
      • Q(a);OGATE,XB(C)::QAR1(F),XQ(a)
      • B(f);N_GUARD::S(B),XB(f)
      • B(f);OGATE,SBLOCK::QAB(F)
      • B(f);N_GUARD::QAR1(F),XB(f)
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