MESON Chess Problem Database

Problem Display
PID: 194672 (4N3/2ppp3/N4B2/3k1n2/B2p1p2/3P3p/7P/K5Q1 w - - 0 1)

Stubbs, Arthur Goodwin

The Observer, 1941

(First published on Sun Mar 2 1941)

4N3/2ppp3/N4B2/3k1n2/B2p1p2/3P3p/7P/K5Q1

#2

8 + 8

15239 Valois Notebooks 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Ke6
      • 2.Qg8#
    • 1...Sd6
      • 2.Sexc7#
    • 1...c5
      • 2.Sac7#
    • 1...c6
      • 2.Bb3#
    • 1...d6
      • 2.Sexc7#
    • 1...e5
      • 2.Qg8#
  • Tries
    • 1.Sb4+?
      • 1...Ke6
        • 2.Qg8#
      • 1...Kc5!
    • 1.Qe1?
      • threat
        • 2.Qe4#
        • 2.Qe5#
      • 1...exf6
        • 2.Qe4#
      • 1...e5
        • 2.Qxe5#
      • 1...Sg3
        • 2.Qe5#
      • 1...Sd6
        • 2.Sexc7#
        • 2.Qe5#
      • 1...d6
        • 2.Sexc7#
        • 2.Qe4#
      • 1...Se3!
    • 1.Qg2+?
      • 1...Ke6
        • 2.Qg8#
      • 1...f3
        • 2.Qa2#
      • 1...hxg2!
  • Keys
    • 1.Qg4!
      • 1...Ke6
        • 2.Qg8#
      • 1...exf6
        • 2.Qxf5#
      • 1...Se3
        • 2.Qxd7#
      • 1...Sg3
        • 2.Qxd7#
      • 1...Sh4
        • 2.Qxd7#
      • 1...Sd6
        • 2.Sexc7#
      • 1...Sh6
        • 2.Qxd7#
      • 1...Sg7
        • 2.Qxd7#
      • 1...f3
        • 2.Qe4#
      • 1...c5
        • 2.Sac7#
      • 1...c6
        • 2.Bb3#
      • 1...d6
        • 2.Sexc7#
      • 1...e5
        • 2.Qg8#
      • 1...e6
        • 2.Qf3#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 8
    • REMOVED MATES = 0
  • Sets
    • K(d);S_FLIGHT::QAB(B)
    • S(e);SBLOCK::S(H),XP(f)
    • P(f);SBLOCK::S(F)
    • P(f);SBLOCK::B(E)
    • P(g);SBLOCK::S(H),XP(f)
    • P(h);N_GUARD::QAB(B)
  • Tries
    • Try
      • S(F);CHECK
      • Vars
        • K(d);S_FLIGHT::QAB(B)
      • Refutation
        • K(d);P-FLIGHT,P_SPINP(b)
    • Try
      • Q(B);
      • Threat
        • DUALS(2)
      • Vars
        • P(h);XB(G)::QAB1(B)
        • P(h);::QAR1(B),XP(h)
        • S(e);::QAR1(B)
      • Refutation
        • S(e);
    • Try
      • Q(B);CHECK
      • Vars
        • K(d);S_FLIGHT::QAB(B)
        • P(c);P_SPINP(c)::QAB(B)
      • Refutation
        • P(a);XQ(B)
  • Actual
    • Q(B);
    • Vars
      • K(d);P_SPINS(e),S_FLIGHT::QAB(B)
      • P(h);N_GUARD,XB(G)::QAR2(B),XS(e)
      • S(e);OGATE::QAR2(B),XP(g)
      • S(e);SBLOCK::S(H),XP(f)
      • P(c);OGATE::QAB1(B)
      • P(f);SBLOCK::S(F)
      • P(f);SBLOCK::B(E)
      • P(g);SBLOCK::S(H),XP(f)
      • P(h);N_GUARD::QAB(B)
      • P(h);SBLOCK::QAB(B)
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