MESON Chess Problem Database

Problem Display
PID: 93743 (8/4p2N/Q2pP3/4k1p1/6P1/4K3/8/8 w - - 0 1)

Derka, Frantisek

Ceske listy sachove, 1899

8/4p2N/Q2pP3/4k1p1/6P1/4K3/8/8

#2

5 + 4

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Tries
    • 1.Qd3?
      • threat
        • 2.Qe4#
        • 2.Qf5#
      • 1...Kxe6
        • 2.Qf5#
      • 1...d5!
    • 1.Qb5+?
      • 1...Kxe6
        • 2.Qf5#
      • 1...d5!
    • 1.Qa5+?
      • 1...Kxe6
        • 2.Qf5#
      • 1...d5!
  • Keys
    • 1.Sf8!
      • 1...Kd5
        • 2.Qb5#
      • 1...Kf6
        • 2.Qa1#
      • 1...d5
        • 2.Sd7#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • Q(C);
      • Threat
        • DUALS(2)
      • Vars
        • K(a);P-FLIGHT,XP(D)::QAB1(C)
      • Refutation
        • P(c);
    • Try
      • Q(C);CHECK
      • Vars
        • K(a);OGATE,P-FLIGHT,XP(D)::QAB1(C)
      • Refutation
        • P(c);P_SPINP(c)
    • Try
      • Q(C);CHECK
      • Vars
        • K(a);OGATE,P-FLIGHT,XP(D)::QAB1(C)
      • Refutation
        • P(c);P_SPINP(c)
  • Actual
    • S(E);
    • Vars
      • K(a);P-FLIGHT::QAR2(C)
      • K(a);S_FLIGHT::QAB(C)
      • P(c);SBLOCK::S(E)
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