MESON Chess Problem Database

Problem Display
PID: 48293 (K1R1R3/6Qp/p4n2/p7/1n1p3p/3k4/3p1p2/3rbr2 w - - 0 1)

Dawson, Thomas Rayner

Stratford Express, 1942

(First published on Fri Jan 9 1942)

K1R1R3/6Qp/p4n2/p7/1n1p3p/3k4/3p1p2/3rbr2

#2

4 + 13

3979 Systematic Terminology 1984
15256 TRD Scrapbook 2014

SOLUTION

  • SOUND
  • Sets
    • 1...Sg4
      • 2.Qxh7#
    • 1...Sd5
      • 2.Qxh7#
    • 1...Sh5
      • 2.Qxh7#
    • 1...Sd7
      • 2.Qxh7#
    • 1...Sg8
      • 2.Qxh7#
    • 1...h3
      • 2.Qg3#
  • Tries
    • 1.Qxf6?
      • threat
        • 2.Qf3#
        • 2.Qf5#
      • 1...Sc2
        • 2.Qf5#
        • 2.Qxa6#
      • 1...Sd5
        • 2.Qf5#
        • 2.Qxa6#
      • 1...Sc6!
    • 1.Qg2?
      • threat
        • 2.Qxf1#
        • 2.Qf3#
        • 2.Qh3#
      • 1...Sxe8
        • 2.Qf3#
      • 1...Se4
        • 2.Qf3#
        • 2.Qxe4#
      • 1...Rg1
        • 2.Qf3#
      • 1...Rh1
        • 2.Qf3#
      • 1...Sc2
        • 2.Qxf1#
      • 1...Sbd5
        • 2.Qxf1#
      • 1...Sg4
        • 2.Qxf1#
        • 2.Qe4#
      • 1...Sfd5
        • 2.Qxf1#
        • 2.Qe4#
      • 1...Sh5
        • 2.Qxf1#
        • 2.Qf3#
        • 2.Qe4#
      • 1...h3
        • 2.Qxf1#
        • 2.Qf3#
        • 2.Qxh3#
        • 2.Qg3#
      • 1...Sc6!
    • 1.Qg6+?
      • 1...Se4
        • 2.Qxe4#
      • 1...hxg6!
    • 1.Qxh7+?
      • 1...Se4
        • 2.Qxe4#
      • 1...Sxh7!
  • Keys
    • 1.Qb7!
      • threat
        • 2.Qf3#
      • 1...Sc6
        • 2.Qb3#
      • 1...Se4
        • 2.Qxe4#
      • 1...Sc2
        • 2.Qxa6#
        • 2.Qb3#
      • 1...Sbd5
        • 2.Qxa6#
      • 1...Sg4
        • 2.Qe4#
        • 2.Qxh7#
      • 1...Sfd5
        • 2.Qxh7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 5
  • Sets
    • S(l);N_GUARD::QAB(A),XP(m)
    • P(i);N_GUARD::QAR(A)
  • Tries
    • Try
      • Q(A);XS(l)
      • Threat
        • DUALS(2)
      • Refutation
        • S(g);
    • Try
      • Q(A);
      • Threat
        • DUALS(3)
      • Vars
        • S(l);XR(D)::QAR2(A)
        • R(c);::QAR2(A)
        • S(g);::QAB(A),XR(c)
      • Refutation
        • S(g);
    • Try
      • Q(A);CHECK
      • Vars
        • S(l);N_GUARD,P_SPINS(l)::QAB1(A),XS(l)
      • Refutation
        • P(m);XQ(A)
    • Try
      • Q(A);CHECK,XP(m)
      • Vars
        • S(l);N_GUARD,P_SPINS(l)::QAB1(A),XS(l)
      • Refutation
        • S(l);XQ(A)
  • Actual
    • Q(A);
    • Threat
      • QAR2(A)
    • Vars
      • S(g);OGATE::QAR2(A)
      • S(l);N_GUARD::QAB1(A),XS(l)
      • S(g);N_GUARD::QAB(A),XP(k)
      • S(l);N_GUARD::QAB(A),XP(m)
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