MESON Chess Problem Database

Problem Display
PID: 154052 (8/8/7p/5p2/6kp/3Q3N/5p1P/5K2 w - - 0 1)

Harley, Brian

The Observer, 1953

(First published on Sun May 3 1953)

8/8/7p/5p2/6kp/3Q3N/5p1P/5K2

#2

4 + 5

15290 Harley Scrapbook 2015
15239 Valois Notebooks 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Kh5
      • 2.Qxf5#
  • Tries
    • 1.Kxf2?
      • threat
        • 2.Qf3#
      • 1...Kh5
        • 2.Qxf5#
      • 1...f4!
    • 1.Qg3+?
      • 1...Kh5
        • 2.Sf4#
      • 1...hxg3!
  • Keys
    • 1.Qd5!
      • 1...Kxh3
        • 2.Qg2#
      • 1...Kh5
        • 2.Qxf5#
      • 1...f4
        • 2.Sxf2#
      • 1...h5
        • 2.Qg2#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • K(b);S_FLIGHT::QAR2(C),XP(d)
  • Tries
    • Try
      • K(A);P-FLIGHT,XP(a)
      • Threat
        • QAB1(C)
      • Vars
        • K(b);S_FLIGHT::QAR2(C),XP(d)
      • Refutation
        • P(d);
    • Try
      • Q(C);CHECK
      • Vars
        • K(b);S_FLIGHT::S(D)
      • Refutation
        • P(c);XQ(C)
  • Actual
    • Q(C);
    • Vars
      • K(b);S_FLIGHT,XS(D)::QAB1(C)
      • K(b);P_SPINP(d),S_FLIGHT::QAR2(C),XP(d)
      • P(d);SBLOCK::S(D),XP(a)
      • P(e);SBLOCK::QAR2(C)
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