MESON Chess Problem Database

Problem Display
PID: 239838 (1b6/3N4/6q1/6Pp/R1Q1PkrB/7p/3P2bK/3B4 w - - 0 1)

Hermanson, Halvar

Themes-64, 1963

1b6/3N4/6q1/6Pp/R1Q1PkrB/7p/3P2bK/3B4

#2

9 + 7

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Qxe4
      • 2.Qf7#
    • 1...Qf7
      • 2.Qxf7#
    • 1...Bf1
      • 2.Qxf1#
    • 1...Bxe4
      • 2.Qf1#
  • Tries
    • 1.Qf1+?
      • 1...Bf3
        • 2.Qxf3#
      • 1...Bxf1!
    • 1.Qf7+?
      • 1...Qf5
        • 2.Qxf5#
      • 1...Qf6
        • 2.Qxf6#
      • 1...Qxf7!
    • 1.Qc3?
      • threat
        • 2.Qe3#
      • 1...Qxe4
        • 2.Qf6#
      • 1...Bxe4
        • 2.Qf3#
      • 1...Rg3
        • 2.Qxg3#
      • 1...Ba7
        • 2.Qe5#
      • 1...Qb6!
    • 1.e5+?
      • 1...Qe4
        • 2.Qf7#
      • 1...Be4
        • 2.Qf1#
      • 1...Kf5!
  • Keys
    • 1.Qc5!
      • threat
        • 2.Qe3#
      • 1...Qxe4
        • 2.Qf8#
      • 1...Bxe4
        • 2.Qf2#
      • 1...Qb6
        • 2.Qf5#
      • 1...Rg3
        • 2.Bxg3#
      • 1...Ba7
        • 2.Qe5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 3
    • REMOVED MATES = 2
  • Sets
    • Q(f);N_GUARD,P_SPINQ(f),XP(F)::QAR(E)
    • Q(f);N_GUARD::QAR(E),XQ(f)
    • B(a);N_GUARD::QAR(E),XB(a)
    • B(a);N_GUARD,P_SPINB(a),XP(F)::QAR(E)
  • Tries
    • Try
      • Q(E);CHECK
      • Vars
        • B(a);N_GUARD,P_SPINB(a)::QAR1(E),XB(a)
      • Refutation
        • B(a);XQ(E)
    • Try
      • Q(E);CHECK
      • Vars
        • Q(f);N_GUARD,P_SPINQ(f)::QAR1(E),XQ(f)
        • Q(f);N_GUARD,P_SPINQ(f)::QAR2(E),XQ(f)
      • Refutation
        • Q(f);XQ(E)
    • Try
      • Q(E);
      • Threat
        • QAB1(E)
      • Vars
        • Q(f);N_GUARD,P_SPINQ(f),XP(F)::QAR2(E)
        • B(a);N_GUARD,P_SPINB(a),XP(F)::QAR1(E)
        • R(d);N_GUARD::QAB1(E),XR(d)
        • B(g);N_GUARD::QAB1(E)
      • Refutation
        • Q(f);
    • Try
      • P(F);CHECK
      • Vars
        • Q(f);P_SPINQ(f)::QAR(E)
        • B(a);P_SPINB(a)::QAR(E)
      • Refutation
        • K(c);P-FLIGHT,P_PINP(F)
  • Actual
    • Q(E);
    • Threat
      • QAB1(E)
    • Vars
      • Q(f);N_GUARD,P_SPINQ(f),XP(F)::QAR(E)
      • B(a);N_GUARD,P_SPINB(a),XP(F)::QAR2(E)
      • Q(f);N_GUARD::QAR1(E)
      • R(d);N_GUARD::B(G),XR(d)
      • B(g);N_GUARD::QAB1(E)
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