MESON Chess Problem Database

Problem Display
PID: 225709 (8/1pp5/2k2N2/1pqN1P1b/1P1RQ3/8/2p5/2K5 w - - 0 1)

Potocny, Vojtech

Praca, 1954

8/1pp5/2k2N2/1pqN1P1b/1P1RQ3/8/2p5/2K5

#2

7 + 7

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Kd6
      • 2.Qe6#
    • 1...Qxd4
      • 2.Qe6#
    • 1...Qb6
      • 2.Sc3#
      • 2.Se3#
      • 2.Sf4#
      • 2.Se7#
      • 2.Qe6#
    • 1...Qa7
      • 2.Qe6#
    • 1...Qc3
      • 2.Qe6#
    • 1...Qc4
      • 2.Qe6#
    • 1...b6
      • 2.Se7#
  • Tries
    • 1.Qe8+?
      • 1...Kd6
        • 2.Se4#
        • 2.Qe6#
      • 1...Bxe8!
  • Keys
    • 1.Sd7!
      • threat
        • 2.Se7#
      • 1...Kd6
        • 2.Qe6#
      • 1...Kxd7
        • 2.Sb6#
      • 1...Qxd4
        • 2.Qe6#
      • 1...Qxd5
        • 2.Qxd5#
      • 1...Qd6
        • 2.Sb8#
      • 1...Qe7
        • 2.Sxe7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 4
  • Sets
    • K(e);P-FLIGHT::QAR1(D)
    • Q(c);N_GUARD,XR(C)::QAR2(D)
    • Q(c);N_GUARD::QAR2(D)
    • P(f);SBLOCK::QAB(D)+S(E),DCHECK
  • Tries
    • Try
      • Q(D);CHECK
      • Refutation
        • B(d);XQ(D)
  • Actual
    • S(G);
    • Threat
      • QAB(D)+S(E),DCHECK
    • Vars
      • K(e);P-FLIGHT::QAR1(D)
      • K(e);S_FLIGHT,XS(G)::R(C)+S(E),DCHECK
      • Q(c);N_GUARD,XR(C)::QAR2(D)
      • Q(c);OGATE,P_SPINQ(c),XS(E)::QAB1(D),XQ(c)
      • Q(c);SBLOCK::S(G)
      • Q(c);::QAB(D)+S(E),DCHECK,XQ(c)
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