MESON Chess Problem Database

Problem Display
PID: 102776 (2N5/1n6/nQ4p1/4k1p1/5pP1/1B3P2/5K2/8 w - - 0 1)

Elkhan, Alexander A

Revue d'Echecs, 1909

2N5/1n6/nQ4p1/4k1p1/5pP1/1B3P2/5K2/8

#2

6 + 6

5454 Near Snap 2009
6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Sa5
      • 2.Qd6#
    • 1...Sc5
      • 2.Qd6#
    • 1...Sd6
      • 2.Qxd6#
    • 1...Sd8
      • 2.Qd6#
  • Tries
    • 1.Qe3+?
      • 1...Kf6
        • 2.Qd4#
        • 2.Qc3#
        • 2.Qe7#
      • 1...fxe3+!
    • 1.Qb4?
      • threat
        • 2.Qc3#
      • 1...Kf6
        • 2.Qc3#
        • 2.Qe7#
        • 2.Qd4#
      • 1...Sxb4!
    • 1.Qxa6?
      • threat
        • 2.Qa1#
      • 1...Sa5
        • 2.Qd6#
      • 1...Kd4!
  • Keys
    • 1.Qa7!
      • 1...Kf6
        • 2.Qd4#
      • 1...Sac5
        • 2.Qa1#
      • 1...Sbc5
        • 2.Qg7#
      • 1...Sb4
        • 2.Qa1#
      • 1...Sc7
        • 2.Qa1#
      • 1...Sb8
        • 2.Qa1#
      • 1...Sa5
        • 2.Qg7#
      • 1...Sd6
        • 2.Qg7#
      • 1...Sd8
        • 2.Qg7#

Anticipated by 4500(1871), 4501(1871), 230671(1879)

This anticipates 140872(1953), 163022(2014)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 4
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
    • S(f);N_GUARD::QAB1(E)
    • S(f);N_GUARD::QAB1(E),XS(f)
  • Tries
    • Try
      • Q(E);CHECK
      • Refutation
        • P(a);CHECK,XQ(E)
    • Try
      • Q(E);
      • Threat
        • QAB(E)
      • Refutation
        • S(d);XQ(E)
    • Try
      • Q(E);XS(d)
      • Threat
        • QAB(E)
      • Vars
        • S(f);N_GUARD::QAB1(E)
      • Refutation
        • K(b);S_FLIGHT
  • Actual
    • Q(E);
    • Vars
      • K(b);S_FLIGHT::QAB(E)
      • S(d);OGATE::QAB(E)
      • S(f);OGATE::QAB(E)
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