MESON Chess Problem Database

Problem Display
PID: 91955 (6R1/r2q3p/p2P3p/3B3k/R5p1/3Q1PP1/8/5K2 w - - 0 1)

Lies, Heinz

Deutsche Schachblatter, 1938

6R1/r2q3p/p2P3p/3B3k/R5p1/3Q1PP1/8/5K2

#2

8 + 7

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qxa4
      • 2.Qf5#
    • 1...Qb5
      • 2.fxg4#
    • 1...Qf5
      • 2.Qxf5#
    • 1...Qc6
      • 2.Qf5#
      • 2.fxg4#
    • 1...Qe8
      • 2.Qf5#
      • 2.fxg4#
    • 1...Qxd6
      • 2.Qf5#
      • 2.fxg4#
    • 1...Qb7
      • 2.Qf5#
      • 2.fxg4#
    • 1...Qc7
      • 2.Qf5#
      • 2.fxg4#
    • 1...Qe7
      • 2.fxg4#
    • 1...Qd8
      • 2.fxg4#
    • 1...gxf3
      • 2.Rh4#
  • Tries
    • 1.Qe2?
      • threat
        • 2.Qh2#
      • 1...gxf3
        • 2.Rh4#
      • 1...Qb5
        • 2.fxg4#
      • 1...Qe7
        • 2.fxg4#
      • 1...Qd8
        • 2.fxg4#
      • 1...Qg7!
  • Keys
    • 1.Ra5!
      • threat
        • 2.Bf7#
      • 1...Qe6
        • 2.Bxe6#
      • 1...Qb5
        • 2.fxg4#
      • 1...Qf5
        • 2.Qxf5#
      • 1...Qf7
        • 2.Bxf7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 4
  • Sets
    • Q(f);N_GUARD,XR(E)::QAR2(B)
    • Q(f);N_GUARD,P_PINQ(B)::P(C),XP(a)
    • Q(f);N_GUARD,P_PINP(C)::QAR2(B),XQ(f)
    • Q(f);N_GUARD::P(C),XP(a)
    • P(a);OGATE,XP(C)::R1(E)
  • Tries
    • Try
      • Q(B);
      • Threat
        • QAR(B)
      • Vars
        • P(a);OGATE,P_SPINP(a),XP(C)::R1(E)
        • Q(f);N_GUARD,P_PINQ(B)::P(C),XP(a)
        • Q(f);N_GUARD::P(C),XP(a)
      • Refutation
        • Q(f);
  • Actual
    • R(E);
    • Threat
      • R(E)+B(F),DCHECK
    • Vars
      • Q(f);N_GUARD::R(E)+B(F),XQ(f)
      • Q(f);N_GUARD,P_PINQ(B)::P(C),XP(a)
      • Q(f);N_GUARD,P_PINP(C)::QAR2(B),XQ(f)
      • Q(f);P_PINP(C)::R(E)+B(F),DCHECK,XQ(f)
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