MESON Chess Problem Database

Problem Display
PID: 184161 (4R3/8/2p5/3k1b2/6n1/1P4B1/3K4/Q7 w - - 0 1)

Holroyd, GC

The Observer, 1927

(First published on Sun Sep 4 1927)

4R3/8/2p5/3k1b2/6n1/1P4B1/3K4/Q7

#2

5 + 4

15239 Valois Notebooks 2018
5454 Near Snap 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Sf2
      • 2.Qe5#
    • 1...Sh2
      • 2.Qe5#
    • 1...Se3
      • 2.Qe5#
    • 1...Se5
      • 2.Qxe5#
    • 1...Sf6
      • 2.Qe5#
    • 1...Sh6
      • 2.Qe5#
  • Tries
    • 1.Re5+?
      • 1...Sxe5
        • 2.Qxe5#
      • 1...Kd6!
  • Keys
    • 1.Be5!
      • threat
        • 2.Qd4#
      • 1...Ke4
        • 2.Qh1#
      • 1...Kc5
        • 2.Qa5#
      • 1...Sxe5
        • 2.Qxe5#
      • 1...c5
        • 2.Qa8#

This anticipates 207840(1992)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 5
  • Sets
    • S(a);N_GUARD::QAR1(A)
    • S(a);N_GUARD::QAR1(A),XS(a)
  • Tries
    • Try
      • R(E);CHECK
      • Vars
        • S(a);OGATE,XR(E)::QAR1(A),XS(a)
      • Refutation
        • K(b);P-FLIGHT
  • Actual
    • B(D);
    • Threat
      • QAR1(A)
    • Vars
      • K(b);S_FLIGHT::QAB(A)
      • K(b);P-FLIGHT::QAR2(A)
      • S(a);OGATE,XB(D)::QAR1(A),XS(a)
      • P(d);OGATEB,SBLOCK::QAB(A)
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