MESON Chess Problem Database

Problem Display
PID: 48143 (b6Q/5p1p/8/4Pp1K/4Pk2/7R/1B6/8 w - - 0 1)

Hermanson, Halvar

Themes-64, 1957

b6Q/5p1p/8/4Pp1K/4Pk2/7R/1B6/8

#2

6 + 5

SOLUTION

  • SOUND
  • Sets
    • 1...Bxe4
      • 2.Bc1#
    • 1...fxe4
      • 2.Qf6#
  • Tries
    • 1.Rf3+?
      • 1...Kxe4
        • 2.Qxa8#
      • 1...Kxf3!
    • 1.Qf6?
      • threat
        • 2.Qh4#
        • 2.Qxf5#
      • 1...Bxe4
        • 2.Bc1#
        • 2.Qh4#
        • 2.Qg5#
        • 2.Qh6#
      • 1...Kxe4!
    • 1.Qxh7?
      • threat
        • 2.Qxf5#
      • 1...Bxe4
        • 2.Qh6#
      • 1...fxe4
        • 2.Qxf7#
      • 1...Kxe4!
    • 1.Qd8?
      • threat
        • 2.Qh4#
      • 1...Kxe4
        • 2.Qd4#
      • 1...fxe4
        • 2.Qg5#
        • 2.Qf6#
      • 1...f6!
    • 1.e6?
      • threat
        • 2.Qe5#
      • 1...Kxe4
        • 2.Qd4#
        • 2.Qe5#
      • 1...f6!
  • Keys
    • 1.Qc8!
      • threat
        • 2.Qxf5#
      • 1...Kxe4
        • 2.Qc4#
      • 1...Bxe4
        • 2.Qc1#
      • 1...fxe4
        • 2.Qg4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • B(e);SBLOCK,XP(C)::B(A)
    • P(b);OGATEB,SBLOCK,XP(C)::QAR2(F)
  • Tries
    • Try
      • R(B);CHECK
      • Vars
        • K(a);P-FLIGHT,XP(C)::QAB(F),XB(e)
      • Refutation
        • K(a);P-FLIGHT,XR(B)
    • Try
      • Q(F);P_PINP(b)
      • Threat
        • DUALS(2)
      • Refutation
        • K(a);N_SPINP(b),P-FLIGHT,XP(C)
    • Try
      • Q(F);XP(d)
      • Threat
        • QAR1(F),XP(b)
      • Vars
        • B(e);SBLOCK,XP(C)::QAB(F)
        • P(b);OGATEB,SBLOCK,XP(C)::QAR(F),XP(c)
      • Refutation
        • K(a);P-FLIGHT,P_SPINP(b),XP(C)
    • Try
      • Q(F);
      • Threat
        • QAR2(F)
      • Vars
        • K(a);OGATEB,P-FLIGHT,XP(C)::QAR1(F)
      • Refutation
        • P(c);
    • Try
      • P(D);
      • Threat
        • QAB1(F)
      • Refutation
        • P(c);
  • Actual
    • Q(F);
    • Threat
      • QAR1(F),XP(b)
    • Vars
      • K(a);OGATEB,P-FLIGHT,XP(C)::QAR2(F)
      • B(e);SBLOCK,XP(C)::QAB(F)
      • P(b);OGATE,SBLOCK,XP(C)::QAR1(F)
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