MESON Chess Problem Database

Problem Display
PID: 134897 (5r2/8/2q5/8/2P1Qp2/3NN2p/7p/4K1kr w - - 0 1)

McDowell, Michael

The Problemist, 2009

5r2/8/2q5/8/2P1Qp2/3NN2p/7p/4K1kr

#2

5 + 7

56 The Problemist 2017

SOLUTION

  • SOUND
  • Sets
    • 1...Qa4
      • 2.Qg6#
    • 1...Qxc4
      • 2.Qg6#
    • 1...Qg6
      • 2.Qxg6#
    • 1...Qc7
      • 2.Qg6#
    • 1...f3
      • 2.Qg4#
  • Tries
    • 1.Sf2?
      • threat
        • 2.Sxh3#
      • 1...Qd7
        • 2.Qxh1#
      • 1...Qe6
        • 2.Qxh1#
      • 1...Qh6
        • 2.Qxh1#
      • 1...Qc8
        • 2.Qxh1#
      • 1...Rh8!
    • 1.Sxf4?
      • threat
        • 2.Se2#
        • 2.Sxh3#
      • 1...Qxc4
        • 2.Sxh3#
        • 2.Qg6#
      • 1...Qd7
        • 2.Se2#
      • 1...Qe6
        • 2.Se2#
      • 1...Qh6
        • 2.Se2#
      • 1...Qc8
        • 2.Se2#
      • 1...Rh8
        • 2.Se2#
      • 1...Rxf4!
  • Keys
    • 1.Sc1!
      • threat
        • 2.Se2#
      • 1...Qxc4
        • 2.Qg6#
      • 1...f3
        • 2.Qg4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 0
    • REMOVED MATES = 3
  • Sets
    • Q(f);N_GUARD::QAR(E)
    • Q(f);N_GUARD,XP(D)::QAR(E)
    • Q(f);N_GUARD::QAR(E),XQ(f)
    • P(e);OGATE::QAR(E)
  • Tries
    • Try
      • S(B);
      • Threat
        • S(B),XP(d)
      • Vars
        • Q(f);N_GUARD::QAR1(E),XR(b)
      • Refutation
        • R(g);
    • Try
      • S(B);XP(e)
      • Threat
        • DUALS(2)
      • Vars
        • Q(f);::S(B)
        • R(g);::S(B)
      • Refutation
        • R(g);XS(B)
  • Actual
    • S(B);
    • Threat
      • S(B)
    • Vars
      • Q(f);N_GUARD,XP(D)::QAR(E)
      • P(e);OGATE::QAR(E)
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