MESON Chess Problem Database

Problem Display
PID: 235670 (2n1k3/5p2/5B2/3P4/1Q6/8/8/7K w - - 0 1)

Hoffmann, Fritz

Mat, 1972

2n1k3/5p2/5B2/3P4/1Q6/8/8/7K

#2

4 + 3

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Sb6
      • 2.Qe7#
    • 1...Sa7
      • 2.Qe7#
    • 1...Se7
      • 2.Qxe7#
  • Tries
    • 1.Qc5?
      • threat
        • 2.Qxc8#
      • 1...Kd7
        • 2.Qc6#
      • 1...Se7
        • 2.Qxe7#
      • 1...Sb6
        • 2.Qe7#
      • 1...Sa7
        • 2.Qe7#
      • 1...Sd6!
    • 1.Qd6?
      • threat
        • 2.Qd8#
      • 1...Se7
        • 2.Qxe7#
      • 1...Sxd6!
    • 1.Qf8+?
      • 1...Kd7
        • 2.Qd8#
      • 1...Kxf8!
    • 1.Qb8?
      • threat
        • 2.Qxc8#
      • 1...Kf8
        • 2.Qxc8#
      • 1...Kd7!
  • Keys
    • 1.Qb7!
      • threat
        • 2.Qxc8#
      • 1...Kf8
        • 2.Qxc8#
      • 1...Se7
        • 2.Qxe7#
      • 1...Sb6
        • 2.Qe7#
      • 1...Sd6
        • 2.Qe7#
      • 1...Sa7
        • 2.Qe7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • S(b);N_GUARD::QAR1(B)
    • S(b);N_GUARD::QAR1(B),XS(b)
  • Tries
    • Try
      • Q(B);
      • Threat
        • QAR2(B),XS(b)
      • Vars
        • K(c);S_FLIGHT::QAB1(B)
        • S(b);N_GUARD::QAR1(B),XS(b)
        • S(b);N_GUARD::QAR1(B)
      • Refutation
        • S(b);
    • Try
      • Q(B);
      • Threat
        • QAR1(B)
      • Vars
        • S(b);N_GUARD::QAR1(B),XS(b)
      • Refutation
        • S(b);XQ(B)
    • Try
      • Q(B);CHECK
      • Vars
        • K(c);OGATE,S_FLIGHT::QAR1(B)
      • Refutation
        • K(c);P-FLIGHT,XQ(B)
    • Try
      • Q(B);P_PINS(b)
      • Threat
        • QAR2(B),XS(b)
      • Vars
        • K(c);P-FLIGHT::QAR(B),XS(b)
      • Refutation
        • K(c);N_SPINS(b),S_FLIGHT
  • Actual
    • Q(B);
    • Threat
      • QAR2(B),XS(b)
    • Vars
      • K(c);P-FLIGHT::QAR(B),XS(b)
      • S(b);N_GUARD::QAR1(B),XS(b)
      • S(b);N_GUARD::QAR1(B)
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