MESON Chess Problem Database

Problem Display
PID: 225875 (4n3/p2p4/pB1kpP2/P3p3/1K2P3/8/8/5Q2 w - - 0 1)

Krocian, Jan

Praca, 1948

4n3/p2p4/pB1kpP2/P3p3/1K2P3/8/8/5Q2

#2

6 + 7

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Tries
    • 1.Bd8?
      • threat
        • 2.Qxa6#
      • 1...Kc6
        • 2.Qxa6#
      • 1...Sc7!
    • 1.Qb5?
      • threat
        • 2.Qc5#
      • 1...axb6
        • 2.Qxb6#
      • 1...axb5!
    • 1.Qg1?
      • threat
        • 2.Qc5#
      • 1...axb6
        • 2.Qxb6#
      • 1...Kc6!
    • 1.Qf2?
      • threat
        • 2.Qc5#
      • 1...axb6
        • 2.Qxb6#
      • 1...Kc6!
  • Keys
    • 1.Qxa6!
      • threat
        • 2.Bd8#
      • 1...Kc6
        • 2.Bd8#
      • 1...axb6
        • 2.Qxb6#
      • 1...Sc7
        • 2.Bc5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • B(E);
      • Threat
        • QAR(A),XP(b)
      • Vars
        • K(c);P-FLIGHT::QAR2(A),XP(b)
      • Refutation
        • S(g);
    • Try
      • Q(A);
      • Threat
        • QAB1(A)
      • Vars
        • P(e);OGATE,XB(E)::QAR2(A),XP(e)
      • Refutation
        • P(b);XQ(A)
    • Try
      • Q(A);
      • Threat
        • QAB1(A)
      • Vars
        • P(e);OGATE,XB(E)::QAR2(A),XP(e)
      • Refutation
        • K(c);P-FLIGHT
    • Try
      • Q(A);
      • Threat
        • QAB1(A)
      • Vars
        • P(e);OGATE,XB(E)::QAR2(A),XP(e)
      • Refutation
        • K(c);P-FLIGHT
  • Actual
    • Q(A);XP(b)
    • Threat
      • QAR(A)+B(E)
    • Vars
      • K(c);P-FLIGHT::QAR(A)+B(E)
      • P(e);OGATE,P_SPINP(e),XB(E)::QAR2(A),XP(e)
      • S(g);SBLOCK::QAR(A)+B(E),DCHECK
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