MESON Chess Problem Database

Problem Display
PID: 1151 (7R/4Nb2/8/K7/6kn/3Q3N/4nP2/8 w - - 0 1)

Shire, David J

1st Prize, Problem Observer, 1988

7R/4Nb2/8/K7/6kn/3Q3N/4nP2/8

#2

6 + 4

SOLUTION

  • SOUND
  • Sets
    • 1...Sc1
      • 2.Qg3#
    • 1...Sg1
      • 2.Qg3#
    • 1...Sc3
      • 2.Qg3#
    • 1...Sg3
      • 2.Qxg3#
    • 1...Sd4
      • 2.Qg3#
    • 1...Sf4
      • 2.Qg3#
    • 1...Sg2
      • 2.Qxe2#
      • 2.Qf5#
    • 1...Sf3
      • 2.Qf5#
    • 1...Sf5
      • 2.Qxe2#
      • 2.Qxf5#
    • 1...Sg6
      • 2.Qxe2#
      • 2.Qf5#
  • Tries
    • 1.Qxe2+?
      • 1...Sf3
        • 2.Qe4#
      • 1...Kxh3!
    • 1.Qe4+?
      • 1...Kxh3
        • 2.Rxh4#
      • 1...Sf4!
  • Keys
    • 1.Sf5!
      • threat
        • 2.Rxh4#
      • 1...Sxf5
        • 2.Qxe2#
      • 1...Bh5
        • 2.Sh6#
      • 1...Sg2
        • 2.f3#
      • 1...Sf3
        • 2.Se3#
      • 1...Sg6
        • 2.f3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 4
    • REMOVED MATES = 6
  • Sets
    • S(a);N_GUARD::QAR1(B)
    • S(a);N_GUARD::QAR1(B),XS(a)
    • S(c);N_GUARD::QAB1(B)
  • Tries
    • Try
      • Q(B);CHECK,XS(a)
      • Vars
        • S(c);P_SPINS(c)::QAR2(B)
      • Refutation
        • K(b);P_SPINS(c),S_FLIGHT,XS(C)
    • Try
      • Q(B);CHECK
      • Vars
        • K(b);P_SPINS(c),S_FLIGHT,XS(C)::R1(F),XS(c)
      • Refutation
        • S(a);P_SPINS(a)
  • Actual
    • S(E);
    • Threat
      • R1(F),XS(c)
    • Vars
      • S(c);N_GUARD,SBLOCK,XS(E)::QAB(B),XS(a)
      • B(d);SBLOCK::S(E)
      • S(c);N_GUARD::P(A)
      • S(c);SBLOCK::S(E)
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