MESON Chess Problem Database

Problem Display
PID: 152713 (2R5/8/3k4/3N2p1/4K1Q1/8/8/8 w - - 0 1)

Harley, Brian

The Observer, 1932

(First published on Sun Sep 4 1932)

2R5/8/3k4/3N2p1/4K1Q1/8/8/8

#2

4 + 2

15290 Harley Scrapbook 2014
5454 Near Snap 2014
3713 Snap 2014
15239 Valois Notebooks 2018

SOLUTION

  • SOUND
  • Tries
    • 1.Sf4?
      • threat
        • 2.Qe6#
      • 1...Ke7
        • 2.Qe6#
      • 1...gxf4!
    • 1.Qxg5?
      • threat
        • 2.Qe7#
      • 1...Ke6
        • 2.Qe7#
      • 1...Kd7!
  • Keys
    • 1.Kf5!
      • 1...Kxd5
        • 2.Qd1#
      • 1...Kd7
        • 2.Ke5#

Anticipated by 4549(1879), 9653(1907), 196940(1919)

This anticipates 81245(1966)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • S(C);
      • Threat
        • QAR1(B)
      • Vars
        • K(b);S_FLIGHT::QAR1(B)
      • Refutation
        • P(a);XS(C)
    • Try
      • Q(B);XP(a)
      • Threat
        • QAB1(B)
      • Vars
        • K(b);P-FLIGHT::QAR1(B)
      • Refutation
        • K(b);P-FLIGHT
  • Actual
    • K(A);S_FLIGHT
    • Vars
      • K(b);OGATEB,P-FLIGHT,XS(C)::QAR(B)
      • K(b);P-FLIGHT::QAB(B)+K(A)
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