MESON Chess Problem Database

Problem Display
PID: 93822 (N3B3/4P3/1RNk1q2/3P1P2/1P3P2/5P2/1p1QK3/8 w - - 0 1)

Lacny, Ludovit

Sachove umeni (Ceskoslovensky sach), 1952

N3B3/4P3/1RNk1q2/3P1P2/1P3P2/5P2/1p1QK3/8

#2

12 + 3

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qe5+
      • 2.fxe5#
    • 1...Qxe7+
      • 2.Se5#
    • 1...Qe6+
      • 2.dxe6#
    • 1...Qf8
      • 2.exf8Q#
      • 2.exf8B#
  • Tries
    • 1.Qd4?
      • threat
        • 2.Qc5#
      • 1...Qe5+
        • 2.Qxe5#
        • 2.fxe5#
      • 1...Qxe7+
        • 2.Se5#
      • 1...Qe6+
        • 2.dxe6#
      • 1...Qxd4!
  • Keys
    • 1.Qe3!
      • threat
        • 2.Qc5#
      • 1...Kxd5
        • 2.Qc5#
      • 1...Qxe7
        • 2.Sxe7#
      • 1...Qc3
        • 2.Qe6#
      • 1...Qd4
        • 2.Qe6#
      • 1...Qe5
        • 2.Qxe5#
      • 1...Qe6
        • 2.Qxe6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 3
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • Q(c);CHECK,OGATE::P(E),XQ(c)
    • Q(c);CHECK,SBLOCK,XP(J)::R(H)+S(I)
    • Q(c);CHECK,OGATE::QAR(A)+P(F),XQ(c)
    • Q(c);OGATE::PXQ(c)=Q
  • Tries
    • Try
      • Q(A);
      • Threat
        • QAB1(A)
      • Vars
        • Q(c);CHECK,SBLOCK,XP(J)::R(H)+S(I)
        • Q(c);CHECK,OGATE::QAR(A)+P(F),XQ(c)
      • Refutation
        • Q(c);XQ(A)
  • Actual
    • Q(A);
    • Threat
      • QAB1(A)
    • Vars
      • K(b);P-FLIGHT,XP(F)::QAR1(A)
      • Q(c);P_PINQ(A),XP(J)::R(H)+S(I),XQ(c)
      • Q(c);N_GUARD::QAR1(A)
      • Q(c);N_GUARD,P_PINQ(A)::QAB1(A),XQ(c)
      • Q(c);N_GUARD,P_PINQ(A)::QAR1(A),XQ(c)
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