MESON Chess Problem Database

Problem Display
PID: 89390 (8/2K5/p7/kp6/1p6/1p6/PQ6/8 w - - 0 1)

Hersom, Donald H

The Problemist, 1933

8/2K5/p7/kp6/1p6/1p6/PQ6/8

#2

3 + 5

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...bxa2
      • 2.Qxa2#
  • Tries
    • 1.Kc6?
      • 1...bxa2
        • 2.Qxa2#
      • 1...Ka4!
    • 1.Kb7?
      • 1...bxa2
        • 2.Qxa2#
      • 1...Ka4!
    • 1.a3?
      • 1...bxa3
        • 2.Qxa3#
      • 1...Ka4!
  • Keys
    • 1.a4!
      • 1...Kxa4
        • 2.Qa1#
      • 1...bxa4
        • 2.Qe5#
      • 1...bxa4 ep
        • 2.Qxa3#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • P(a);OGATE,XP(A)::QAR(B),XP(a)
  • Tries
    • Try
      • K(C);P-FLIGHT
      • Vars
        • P(a);OGATE,XP(A)::QAR(B),XP(a)
      • Refutation
        • K(c);P-FLIGHT
    • Try
      • K(C);P-FLIGHT
      • Vars
        • P(a);OGATE,XP(A)::QAR(B),XP(a)
      • Refutation
        • K(c);P-FLIGHT
    • Try
      • P(A);
      • Vars
        • P(b);OGATE,XP(A)::QAR2(B),XP(b)
      • Refutation
        • K(c);P-FLIGHT
  • Actual
    • P(A);
    • Vars
      • K(c);OGATEB,P-FLIGHT,XP(A)::QAR(B)
      • P(d);OGATEB,SBLOCK,XP(A)::QAR(B)
      • P(b);EP,OGATEB,XP(A)::QAR2(B),XP(b)
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