MESON Chess Problem Database

Problem Display
PID: 221672 (8/8/6n1/5R2/4k1P1/8/1nKQ4/8 w - - 0 1)

Shire, David J

The Problemist, 1987

8/8/6n1/5R2/4k1P1/8/1nKQ4/8

#2

4 + 3

5454 Near Snap 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Sd1
      • 2.Qd3#
    • 1...Sd3
      • 2.Qxd3#
    • 1...Sa4
      • 2.Qd3#
    • 1...Sc4
      • 2.Qd3#
    • 1...Sf4
      • 2.Qxf4#
    • 1...Sh4
      • 2.Qf4#
    • 1...Se5
      • 2.Rf4#
    • 1...Se7
      • 2.Qf4#
    • 1...Sf8
      • 2.Qf4#
    • 1...Sh8
      • 2.Qf4#
  • Tries
    • 1.Qd6?
      • 1...Sf4
        • 2.Qxf4#
      • 1...Sd1
        • 2.Qd3#
      • 1...Sd3
        • 2.Qxd3#
      • 1...Sa4
        • 2.Qd3#
      • 1...Sc4
        • 2.Qd3#
      • 1...Sh4
        • 2.Qf4#
        • 2.Qe5#
      • 1...Se5
        • 2.Qxe5#
      • 1...Se7
        • 2.Qf4#
        • 2.Qe5#
      • 1...Sf8
        • 2.Qf4#
        • 2.Qe5#
      • 1...Sh8
        • 2.Qf4#
        • 2.Qe5#
      • 1...Ke3!
    • 1.g5?
      • 1...Sd3
        • 2.Qxd3#
      • 1...Sf4
        • 2.Qxf4#
      • 1...Sd1
        • 2.Qd3#
      • 1...Sa4
        • 2.Qd3#
      • 1...Sc4
        • 2.Qd3#
      • 1...Sh4
        • 2.Qf4#
      • 1...Se5
        • 2.Rf4#
      • 1...Se7
        • 2.Qf4#
      • 1...Sf8
        • 2.Qf4#
      • 1...Sh8
        • 2.Qf4#
      • 1...Kxf5!
  • Keys
    • 1.Qc3!
      • 1...Sd3
        • 2.Qxd3#
      • 1...Se5
        • 2.Qxe5#
      • 1...Sd1
        • 2.Qd3#
      • 1...Sa4
        • 2.Qd3#
      • 1...Sc4
        • 2.Qd3#
      • 1...Sf4
        • 2.Re5#
      • 1...Sh4
        • 2.Qe5#
      • 1...Se7
        • 2.Qe5#
      • 1...Sf8
        • 2.Qe5#
      • 1...Sh8
        • 2.Qe5#

Anticipated by 110804(1889), 100034(1934)

FEATURES

  • Static
    • TYPE = MUTATE
    • CHANGED MATES = 6
    • ADDED MATES = 0
    • REMOVED MATES = 0
  • Sets
    • S(a);N_GUARD::QAB1(B)
    • S(a);N_GUARD::QAB1(B),XS(a)
    • S(c);N_GUARD::QAR1(B),XS(c)
    • S(c);N_GUARD::QAR1(B)
    • S(c);N_GUARD,SBLOCK::R1(D)
  • Tries
    • Try
      • Q(B);
      • Vars
        • S(c);N_GUARD::QAR1(B),XS(c)
        • S(a);N_GUARD::QAB1(B)
        • S(a);N_GUARD::QAB1(B),XS(a)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • P(C);
      • Vars
        • S(a);N_GUARD::QAB1(B),XS(a)
        • S(c);N_GUARD::QAR1(B),XS(c)
        • S(a);N_GUARD::QAB1(B)
        • S(c);N_GUARD::QAR1(B)
        • S(c);N_GUARD,SBLOCK::R1(D)
      • Refutation
        • K(b);S_FLIGHT,XR(D)
  • Actual
    • Q(B);
    • Vars
      • S(a);N_GUARD::QAB1(B),XS(a)
      • S(c);N_GUARD::QAR1(B),XS(c)
      • S(a);N_GUARD::QAB1(B)
      • S(c);N_GUARD,SBLOCK::R1(D)
      • S(c);N_GUARD::QAR1(B)
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