MESON Chess Problem Database

Problem Display
PID: 42188 (8/5p2/4B1NQ/4PP2/4kP2/2K5/3P2P1/5n2 w - - 0 1)

Dawson, Thomas Rayner

British Chess Magazine, 1948

8/5p2/4B1NQ/4PP2/4kP2/2K5/3P2P1/5n2

#2

9 + 3

3979 Systematic Terminology 1984
15256 TRD Scrapbook 2014

SOLUTION

  • SOUND
  • Sets
    • 1...Se3
      • 2.d3#
  • Tries
    • 1.Bd5+?
      • 1...Kxf5
        • 2.Qg5#
        • 2.Qh5#
      • 1...Kxd5!
    • 1.Qh3?
      • threat
        • 2.Qd3#
        • 2.Qf3#
        • 2.d3#
      • 1...Sxd2
        • 2.Qd3#
      • 1...fxe6
        • 2.Qd3#
      • 1...fxg6
        • 2.Qf3#
      • 1...Sh2
        • 2.Qd3#
        • 2.Qe3#
        • 2.d3#
      • 1...Se3
        • 2.Qxe3#
        • 2.Qf3#
        • 2.d3#
      • 1...Sg3!
    • 1.Qh5?
      • threat
        • 2.Qf3#
      • 1...Sxd2
        • 2.Qe2#
      • 1...Sh2
        • 2.Qe2#
      • 1...fxe6!
  • Keys
    • 1.Qh1!
      • threat
        • 2.g3#
        • 2.g4#
      • 1...Sxd2
        • 2.Qe1#
      • 1...fxe6
        • 2.g4#
      • 1...fxg6
        • 2.g3#
      • 1...Sh2
        • 2.Qb1#
        • 2.Qe1#
      • 1...Se3
        • 2.d3#
      • 1...Sg3
        • 2.Qb1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • S(a);SBLOCK::P(A)
  • Tries
    • Try
      • B(G);CHECK
      • Refutation
        • K(b);S_FLIGHT,XB(G)
    • Try
      • Q(I);
      • Threat
        • DUALS(3)
      • Vars
        • S(a);XP(A)::QAB1(I)
        • P(c);XB(G)::QAB1(I)
        • P(c);XS(H)::QAB1(I)
      • Refutation
        • S(a);
    • Try
      • Q(I);
      • Threat
        • QAB1(I)
      • Vars
        • S(a);N_GUARD,XP(A)::QAR2(I)
        • S(a);N_GUARD::QAR2(I)
      • Refutation
        • P(c);XB(G)
  • Actual
    • Q(I);
    • Threat
      • DUALS(2)
    • Vars
      • S(a);OGATE,XP(A)::QAR(I)
      • P(c);XB(G)::QAB(I)+P(B)
      • P(c);XS(H)::QAB(I)+P(B)
      • S(a);SBLOCK::P(A)
      • S(a);OGATE::QAB(I)
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