MESON Chess Problem Database

Problem Display
PID: 18459 (4R2n/4Bk2/2B1p2K/1p3q2/8/5R2/5Q2/5rnb w - - 0 1)

Hasenzahl, Karl

1st HM., To Mat, 1955

4R2n/4Bk2/2B1p2K/1p3q2/8/5R2/5Q2/5rnb

#2

6 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Qf4+
      • 2.Rxf4#
    • 1...Qf6+
      • 2.Rxf6#
    • 1...e5
      • 2.Qa2#
  • Tries
    • 1.Qg3?
      • threat
        • 2.Qg7#
        • 2.Qg8#
      • 1...Qf4+
        • 2.Qxf4#
      • 1...e5
        • 2.Qg8#
      • 1...Sg6
        • 2.Qxg6#
      • 1...Qf6+!
    • 1.Qa7?
      • threat
        • 2.Bh4#
        • 2.Bg5#
        • 2.Bd8#
        • 2.Rf8#
      • 1...Qf4+
        • 2.Bg5#
      • 1...Qf6+
        • 2.Bxf6#
      • 1...e5
        • 2.Bh4#
        • 2.Bg5#
        • 2.Bd8#
        • 2.Qa2#
      • 1...Ra1
        • 2.Rf8#
      • 1...Rd1
        • 2.Rf8#
      • 1...Sg6!
    • 1.Qb2?
      • threat
        • 2.Qg7#
      • 1...Qf6+
        • 2.Qxf6#
      • 1...e5
        • 2.Qa2#
        • 2.Qb3#
      • 1...Qf4+!
  • Keys
    • 1.Qd4!
      • threat
        • 2.Qg7#
      • 1...Qf4+
        • 2.Qxf4#
      • 1...Qf6+
        • 2.Qxf6#
      • 1...e5
        • 2.Qd5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 3
    • ADDED MATES = 0
    • REMOVED MATES = 0
  • Sets
    • Q(e);CHECK,OGATEB::R(B),XQ(e)
    • Q(e);CHECK,OGATE::R1(B),XQ(e)
    • P(f);OGATEB::QAB(A)
  • Tries
    • Try
      • Q(A);
      • Threat
        • DUALS(2)
      • Vars
        • Q(e);CHECK,OGATEB::QAR(A),XQ(e)
        • P(f);::QAB1(A)
        • S(h);N_GUARD::QAB1(A),XS(h)
      • Refutation
        • Q(e);CHECK
    • Try
      • Q(A);
      • Threat
        • DUALS(4)
      • Vars
        • Q(e);CHECK::QAR(A)+B(E)
        • Q(e);CHECK::QAR(A)+B(E),XQ(e)
        • R(a);::R1(F)
      • Refutation
        • S(h);
    • Try
      • Q(A);
      • Threat
        • QAR1(A)
      • Vars
        • Q(e);CHECK,N_GUARD::QAR1(A),XQ(e)
      • Refutation
        • Q(e);CHECK
  • Actual
    • Q(A);
    • Threat
      • QAR1(A)
    • Vars
      • Q(e);CHECK,OGATEB::QAR(A),XQ(e)
      • Q(e);CHECK,N_GUARD::QAR1(A),XQ(e)
      • P(f);OGATEB::QAB(A)
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