MESON Chess Problem Database

Problem Display
PID: 161509 (8/7R/3r4/3p1pkB/8/7Q/5K2/8 w - - 0 1)

Wingrove, E

The Observer, 1923

(First published on Sun May 6 1923)

8/7R/3r4/3p1pkB/8/7Q/5K2/8

#2

4 + 4

15239 Valois Notebooks 2017

SOLUTION

  • SOUND
  • Sets
    • 1...Kf4
      • 2.Qe3#
    • 1...Rf6
      • 2.Qg3#
  • Tries
    • 1.Qxf5+?
      • 1...Kh4
        • 2.Bg6#
        • 2.Qg4#
      • 1...Kxf5!
    • 1.Qe3+?
      • 1...Kh4
        • 2.Qg3#
      • 1...Kf6
        • 2.Rf7#
        • 2.Qe7#
      • 1...f4!
  • Keys
    • 1.Bg6!
      • threat
        • 2.Qxf5#
      • 1...Kf4
        • 2.Qxf5#
      • 1...Kf6
        • 2.Qxf5#
      • 1...Kxg6
        • 2.Qh6#
      • 1...Rxg6
        • 2.Qh4#
      • 1...Rf6
        • 2.Qg3#
      • 1...f4
        • 2.Qf5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • K(c);S_FLIGHT::QAB1(B)
    • R(d);SBLOCK::QAR2(B)
  • Tries
    • Try
      • Q(B);CHECK,XP(b)
      • Refutation
        • K(c);P-FLIGHT,XQ(B)
    • Try
      • Q(B);CHECK
      • Vars
        • K(c);S_FLIGHT::QAB1(B)
      • Refutation
        • P(b);P_SPINP(b)
  • Actual
    • B(C);
    • Threat
      • QAR1(B),XP(b)
    • Vars
      • K(c);S_FLIGHT::QAR1(B),XP(b)
      • K(c);P-FLIGHT,XB(C)::QAR1(B)
      • R(d);SBLOCK,XB(C)::QAB1(B)
      • R(d);SBLOCK::QAR2(B)
      • P(b);::QAR1(B)
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