MESON Chess Problem Database

Problem Display
PID: 153779 (8/8/3pNp2/3PkP2/5p2/3P1K2/4P3/7Q w - - 0 1)

Harley, Brian

The Observer, 1948

(First published on Sun Sep 5 1948)

8/8/3pNp2/3PkP2/5p2/3P1K2/4P3/7Q

#2

7 + 4

15290 Harley Scrapbook 2015
15239 Valois Notebooks 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Kxd5
      • 2.Kxf4#
    • 1...Kxf5
      • 2.Qh5#
  • Tries
    • 1.Kf2?
      • threat
        • 2.Qe4#
      • 1...Kxf5
        • 2.Qh5#
      • 1...f3!
    • 1.Sxf4?
      • 1...Kxf5
        • 2.Qh5#
      • 1...Kd4!
    • 1.Sc7?
      • 1...Kxf5
        • 2.Qh5#
      • 1...Kd4!
    • 1.Qg2?
      • 1...Kxd5
        • 2.Kxf4#
      • 1...Kxf5!
    • 1.Qh2?
      • 1...Kxf5
        • 2.Qh5#
      • 1...Kxd5!
    • 1.Qh4?
      • 1...Kxf5
        • 2.Qh5#
      • 1...Kxd5!
    • 1.Qh6?
      • 1...Kxf5
        • 2.Qh5#
      • 1...Kxd5!
    • 1.Qh8?
      • 1...Kxf5
        • 2.Qh5#
      • 1...Kxd5!
    • 1.e3?
      • 1...Kxd5
        • 2.Kxf4#
      • 1...Kxf5
        • 2.Qh5#
      • 1...fxe3!
    • 1.d4+?
      • 1...Kxf5
        • 2.Qb1#
        • 2.Qh5#
        • 2.Qh7#
      • 1...Kxd5!
  • Keys
    • 1.Qb1!
      • 1...Kxd5
        • 2.Qb5#
      • 1...Kxf5
        • 2.d4#

FEATURES

  • Static
    • TYPE = MUTATE
    • CHANGED MATES = 2
    • ADDED MATES = 0
    • REMOVED MATES = 0
  • Sets
    • K(b);P-FLIGHT,XP(E)::QAB(A)+K(D),XP(a)
    • K(b);OGATEB,P-FLIGHT,XP(F)::QAR2(A)
  • Tries
    • Try
      • K(D);P-FLIGHT
      • Threat
        • QAR1(A)
      • Vars
        • K(b);OGATEB,P-FLIGHT,XP(F)::QAR2(A)
      • Refutation
        • P(a);
    • Try
      • S(G);XP(a)
      • Vars
        • K(b);OGATEB,P-FLIGHT,XP(F)::QAR2(A)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • S(G);
      • Vars
        • K(b);OGATEB,P-FLIGHT,XP(F)::QAR2(A)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • Q(A);
      • Vars
        • K(b);P-FLIGHT,XP(E)::QAB(A)+K(D),XP(a)
      • Refutation
        • K(b);P-FLIGHT,XP(F)
    • Try
      • Q(A);P_PINP(a)
      • Vars
        • K(b);N_SPINP(a),OGATEB,P-FLIGHT,XP(F)::QAR2(A)
      • Refutation
        • K(b);N_SPINP(a),P-FLIGHT,XP(E)
    • Try
      • Q(A);
      • Vars
        • K(b);OGATEB,P-FLIGHT,XP(F)::QAR2(A)
      • Refutation
        • K(b);P-FLIGHT,XP(E)
    • Try
      • Q(A);
      • Vars
        • K(b);OGATEB,P-FLIGHT,XP(F)::QAR2(A)
      • Refutation
        • K(b);P-FLIGHT,XP(E)
    • Try
      • Q(A);P_PINP(d)
      • Vars
        • K(b);N_SPINP(d),OGATEB,P-FLIGHT,XP(F)::QAR2(A)
      • Refutation
        • K(b);N_SPINP(d),P-FLIGHT,XP(E)
    • Try
      • P(B);
      • Vars
        • K(b);P-FLIGHT,XP(E)::QAB(A)+K(D),XP(a)
        • K(b);OGATEB,P-FLIGHT,XP(F)::QAR2(A)
      • Refutation
        • P(a);XP(B)
    • Try
      • P(C);CHECK
      • Refutation
        • K(b);P-FLIGHT,XP(E)
  • Actual
    • Q(A);
    • Vars
      • K(b);OGATEB,P-FLIGHT,XP(E)::QAR2(A)
      • K(b);P-FLIGHT,XP(F)::QAB(A)+P(C)
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