MESON Chess Problem Database

Problem Display
PID: 195910 (1nnR4/p3k3/R7/N7/p3K3/1BpQ4/8/8 w - - 0 1)

Looijen, JW

Haagsche Post, 1921

1nnR4/p3k3/R7/N7/p3K3/1BpQ4/8/8

#2

6 + 6

SOLUTION

  • SOUND
  • Sets
    • 1...Sd7
      • 2.Qxd7#
    • 1...Sb6
      • 2.Qd6#
    • 1...Sd6+
      • 2.Qxd6#
  • Tries
    • 1.Qd5?
      • threat
        • 2.Qg5#
      • 1...Sd6+
        • 2.Qxd6#
      • 1...Sd7
        • 2.Qxd7#
      • 1...axb3!
  • Keys
    • 1.Qd4!
      • threat
        • 2.Qf6#
      • 1...Sd6+
        • 2.Qxd6#
      • 1...Sxa6
        • 2.Sc6#
      • 1...Sd7
        • 2.Sc6#
        • 2.Qxd7#
      • 1...Sc6
        • 2.Sxc6#
      • 1...Sb6
        • 2.Qd6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • S(e);N_GUARD::QAR1(B),XS(e)
    • S(f);N_GUARD::QAB1(B)
    • S(f);CHECK,N_GUARD::QAB1(B),XS(f)
  • Tries
    • Try
      • Q(B);
      • Threat
        • QAB(B)
      • Vars
        • S(f);CHECK,N_GUARD::QAB1(B),XS(f)
        • S(e);N_GUARD::QAR1(B),XS(e)
      • Refutation
        • P(b);XB(A)
  • Actual
    • Q(B);
    • Threat
      • QAB1(B)
    • Vars
      • S(f);CHECK,N_GUARD::QAB1(B),XS(f)
      • S(e);N_GUARD,XR(E)::S(D)
      • S(e);N_GUARD::S(D),XS(e)
      • S(f);N_GUARD::QAB1(B)
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