MESON Chess Problem Database

Problem Display
PID: 152722 (q7/p1pp4/3k4/1PNNpP2/2Q5/8/8/1K1R3b w - - 0 1)

Dawson, Thomas Rayner

The Problemist, 1941

q7/p1pp4/3k4/1PNNpP2/2Q5/8/8/1K1R3b

#2

7 + 7

15256 TRD Scrapbook 2014

SOLUTION

  • SOUND
  • Sets
    • 1...Qb7
      • 2.Sxb7#
    • 1...Qd8
      • 2.Sb7#
    • 1...Qe8
      • 2.Sb7#
    • 1...Qf8
      • 2.Sb7#
    • 1...Qg8
      • 2.Sb7#
    • 1...Qh8
      • 2.Sb7#
    • 1...Be4+
      • 2.Sxe4#
  • Tries
    • 1.Qb4?
      • threat
        • 2.Se4#
        • 2.Sb7#
      • 1...Be4+
        • 2.Sxe4#
      • 1...Qb7
        • 2.Se4#
        • 2.Sxb7#
      • 1...e4!
  • Keys
    • 1.Qh4!
      • threat
        • 2.Qe7#
      • 1...Be4+
        • 2.Sxe4#
      • 1...Kxc5
        • 2.Qb4#
      • 1...Qxd5
        • 2.Sb7#
      • 1...Bxd5
        • 2.Se4#
      • 1...Qd8
        • 2.Sb7#
      • 1...Qe8
        • 2.Sb7#
      • 1...Qf8
        • 2.Sb7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 3
  • Sets
    • Q(g);N_GUARD,P_PINP(D)::S(E),XQ(g)
    • Q(g);N_GUARD::S(E)
    • B(a);CHECK,N_GUARD::S(E),XB(a)
  • Tries
    • Try
      • Q(C);
      • Threat
        • DUALS(2)
      • Vars
        • B(a);CHECK::QAB(C)+S(E),DCHECK,XB(a)
      • Refutation
        • P(b);
  • Actual
    • Q(C);
    • Threat
      • QAB1(C)
    • Vars
      • B(a);CHECK,N_GUARD::S(E),XB(a)
      • K(c);OGATEB,S_FLIGHT,XS(E)::QAB1(C)
      • Q(g);N_GUARD,P_SPINQ(g),XS(F)::S(E)
      • B(a);N_GUARD,P_SPINB(a),XS(F)::S(E)
      • Q(g);N_GUARD::S(E)
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