MESON Chess Problem Database

Problem Display
PID: 238105 (2n5/7B/p7/7Q/8/4pP2/3Pk3/2b2RKn w - - 0 1)

Hermanson, Halvar

Schach, 1958

2n5/7B/p7/7Q/8/4pP2/3Pk3/2b2RKn

#2

6 + 6

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Bxd2
      • 2.f4#
    • 1...Sg3
      • 2.Qh2#
    • 1...exd2
      • 2.Qe5#
  • Tries
    • 1.Re1+?
      • 1...Kxd2
        • 2.Qa5#
      • 1...Kxe1!
    • 1.Qg6?
      • threat
        • 2.Qd3#
      • 1...Kxd2
        • 2.Qc2#
        • 2.Qd3#
      • 1...Sf2!
    • 1.Qh4?
      • threat
        • 2.Qe1#
      • 1...Kxd2
        • 2.Qe1#
      • 1...Bxd2
        • 2.Qc4#
      • 1...exd2
        • 2.Qe4#
      • 1...Sg3
        • 2.Qh2#
      • 1...Sf2!
    • 1.Qb5+?
      • 1...Kxd2
        • 2.Qd3#
      • 1...axb5!
    • 1.Qf5?
      • threat
        • 2.Qd3#
      • 1...Kxd2
        • 2.Qc2#
        • 2.Qd3#
      • 1...Sf2!
    • 1.Qh6?
      • threat
        • 2.Qxe3#
      • 1...Bxd2
        • 2.Qxa6#
      • 1...exd2
        • 2.Qe6#
      • 1...Kxd2!
  • Keys
    • 1.Qc5!
      • threat
        • 2.Qxe3#
      • 1...Kxd2
        • 2.Qc2#
      • 1...Bxd2
        • 2.Qc4#
      • 1...exd2
        • 2.Qe5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 1
    • REMOVED MATES = 1
  • Sets
    • B(a);SBLOCK,XP(C)::QAB(E)+P(D)
    • S(b);N_GUARD::QAR(E)
    • P(d);OGATEB,SBLOCK,XP(C)::QAR(E)
  • Tries
    • Try
      • R(A);CHECK
      • Vars
        • K(c);P-FLIGHT,XP(C)::QAB(E)
      • Refutation
        • K(c);P-FLIGHT,XR(A)
    • Try
      • Q(E);
      • Threat
        • QAB1(E)
      • Refutation
        • S(b);
    • Try
      • Q(E);
      • Threat
        • QAR1(E)
      • Vars
        • K(c);P-FLIGHT,XP(C)::QAB1(E)
        • B(a);SBLOCK,XP(C)::QAB(E)
        • P(d);OGATEB,SBLOCK,XP(C)::QAR2(E)
        • S(b);N_GUARD::QAR(E)
      • Refutation
        • S(b);
    • Try
      • Q(E);CHECK
      • Vars
        • K(c);P-FLIGHT,XP(C)::QAR1(E)
      • Refutation
        • P(e);XQ(E)
    • Try
      • Q(E);
      • Threat
        • QAB1(E)
      • Refutation
        • S(b);
    • Try
      • Q(E);
      • Threat
        • QAR1(E),XP(d)
      • Vars
        • B(a);SBLOCK,XP(C)::QAB(E),XP(e)
        • P(d);OGATEB,SBLOCK,XP(C)::QAR(E)
      • Refutation
        • K(c);P-FLIGHT,P_SPINP(d),XP(C)
  • Actual
    • Q(E);
    • Threat
      • QAR1(E),XP(d)
    • Vars
      • K(c);OGATEB,P-FLIGHT,XP(C)::QAR1(E)
      • B(a);SBLOCK,XP(C)::QAB(E)
      • P(d);OGATEB,SBLOCK,XP(C)::QAR(E)
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