MESON Chess Problem Database

Problem Display
PID: 168260 (2K2b2/1pPR1p2/5P2/2RNkrP1/2Q1Nnr1/3p1P2/6p1/2B1n1q1 w - - 0 1)

Petite, Efren

Die Schwalbe, 1962

2K2b2/1pPR1p2/5P2/2RNkrP1/2Q1Nnr1/3p1P2/6p1/2B1n1q1

#2

11 + 11

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Ke6
      • 2.Sxf4#
    • 1...Sxd5
      • 2.Qxd5#
  • Tries
    • 1.Se3+?
      • 1...Bxc5
        • 2.Sxg4#
      • 1...Sd5!
    • 1.Sxf4+?
      • 1...Bxc5
        • 2.Rd5#
        • 2.Qd5#
      • 1...Qxc5!
    • 1.Se7+?
      • 1...Sd5
        • 2.Qxd5#
      • 1...Qxc5!
    • 1.Bb2+?
      • 1...Ke6
        • 2.Sxf4#
      • 1...Qd4!
  • Keys
    • 1.Sf2!
      • threat
        • 2.Qe4#
      • 1...Ke6
        • 2.Sxf4#
      • 1...Sxd5
        • 2.Qxd5#
      • 1...Se2
        • 2.Se7#
      • 1...Sh3
        • 2.Se7#
      • 1...Sh5
        • 2.Se7#
      • 1...Se6
        • 2.Sxg4#
      • 1...Sg6
        • 2.Se7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
    • K(g);P-FLIGHT::QAB(C)+S(F),DCHECK,XS(e)
    • S(e);OGATE,P_SPINS(e),XS(F)::QAR1(C),XS(e)
  • Tries
    • Try
      • S(F);CHECK
      • Vars
        • B(k);XR(E)::S(F),XR(f)
      • Refutation
        • S(e);P_SPINS(e)
    • Try
      • S(F);CHECK,XS(e)
      • Refutation
        • Q(b);P_PINP(I),XR(E)
    • Try
      • S(F);CHECK
      • Vars
        • S(e);N_GUARD,P_SPINS(e)::QAR1(C),XS(e)
      • Refutation
        • Q(b);P_PINP(I),XR(E)
    • Try
      • B(A);CHECK
      • Vars
        • K(g);P-FLIGHT::QAB(C)+S(F),DCHECK,XS(e)
      • Refutation
        • Q(b);P_SPINQ(b)
  • Actual
    • S(D);
    • Threat
      • QAR1(C)
    • Vars
      • K(g);P-FLIGHT::QAB(C)+S(F),DCHECK,XS(e)
      • S(e);OGATE,P_SPINS(e),XS(F)::QAR1(C),XS(e)
      • S(e);N_GUARD::R(E)+S(F)
      • S(e);SBLOCK::S(D),XR(f)
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