MESON Chess Problem Database

Problem Display
PID: 179254 (5NnK/3p1k1N/3P1p2/8/8/4Q3/4P3/8 w - - 0 1)

Russ, Colin Albert Harry

3rd Prize, Problem Observer, 2010

5NnK/3p1k1N/3P1p2/8/8/4Q3/4P3/8

#2

6 + 4

136 Problem Observer 2011

SOLUTION

  • SOUND
  • Sets
    • 1...Sh6
      • 2.Qe7#
    • 1...Se7
      • 2.Qxe7#
  • Tries
    • 1.Qh3?
      • threat
        • 2.Qh5#
      • 1...Ke8
        • 2.Qxd7#
      • 1...Se7!
    • 1.Qe4?
      • threat
        • 2.Qg6#
      • 1...Se7
        • 2.Qxe7#
      • 1...f5!
  • Keys
    • 1.Sxf6!
      • 1...Kxf6
        • 2.Qf4#
      • 1...Kxf8
        • 2.Qe8#
      • 1...Sxf6
        • 2.Qe7#
      • 1...Sh6
        • 2.Qe7#
      • 1...Se7
        • 2.Qxe7#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • S(d);N_GUARD::QAR1(B)
    • S(d);N_GUARD::QAR1(B),XS(d)
  • Tries
    • Try
      • Q(B);
      • Threat
        • QAB(B)
      • Vars
        • K(c);S_FLIGHT::QAB1(B),XP(b)
      • Refutation
        • S(d);
    • Try
      • Q(B);
      • Threat
        • QAB1(B)
      • Vars
        • S(d);N_GUARD::QAR1(B),XS(d)
      • Refutation
        • P(a);
  • Actual
    • S(D);XP(a)
    • Vars
      • K(c);OGATEB,P-FLIGHT,XS(D)::QAR2(B)
      • K(c);P-FLIGHT,XS(E)::QAR1(B)
      • S(d);N_GUARD,XS(D)::QAR1(B)
      • S(d);N_GUARD::QAR1(B)
      • S(d);N_GUARD::QAR1(B),XS(d)
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