MESON Chess Problem Database

Problem Display
PID: 203695 (4b3/2B4K/2p3p1/4n2p/r3k2r/Q2RN3/n5P1/4N3 w - - 0 1)

Maclay, J Neil

The Observer, 1951

(First published on Sun Dec 9 1951)

4b3/2B4K/2p3p1/4n2p/r3k2r/Q2RN3/n5P1/4N3

#2

7 + 9

15239 Valois Notebooks 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Sxd3
      • 2.Qxd3#
    • 1...Sf3
      • 2.gxf3#
  • Tries
    • 1.Qe7?
      • threat
        • 2.Qxe5#
      • 1...Kf4
        • 2.Qxh4#
        • 2.Qxe5#
      • 1...Ra5!
    • 1.Qxa4+?
      • 1...Sc4
        • 2.Qxc4#
      • 1...Sb4!
  • Keys
    • 1.Qd6!
      • threat
        • 2.Qxe5#
      • 1...Kf4
        • 2.Qxe5#
      • 1...Sxd3
        • 2.Qxd3#
      • 1...Ra5
        • 2.Qd4#
      • 1...Sf3
        • 2.gxf3#
      • 1...Sc4
        • 2.Qd4#
      • 1...Sg4
        • 2.Qf4#
      • 1...Sd7
        • 2.Qxc6#
      • 1...Sf7
        • 2.Qxg6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 0
  • Sets
    • S(e);OGATE,XR(D)::QAB1(C),XS(e)
    • S(e);OGATE::P(B),XS(e)
  • Tries
    • Try
      • Q(C);P_PINS(e)
      • Threat
        • QAR1(C),XS(e)
      • Refutation
        • R(b);
    • Try
      • Q(C);CHECK,XR(b)
      • Vars
        • S(e);N_GUARD,P_SPINS(e)::QAR2(C),XS(e)
      • Refutation
        • S(a);P_SPINS(a)
  • Actual
    • Q(C);
    • Threat
      • QAR1(C),XS(e)
    • Vars
      • K(c);P-FLIGHT,P_SPINS(e)::QAB1(C),XS(e)
      • S(e);OGATE,XR(D)::QAB1(C),XS(e)
      • R(b);N_GUARD::QAR1(C)
      • S(e);OGATE::P(B),XS(e)
      • S(e);S_CUTR(b)::QAR1(C)
      • S(e);OGATE::QAR1(C)
      • S(e);N_GUARD,S_CUTB(i)::QAB(C),XP(g)
      • S(e);N_GUARD,S_CUTB(i)::QAB(C),XP(h)
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