MESON Chess Problem Database

Problem Display
PID: 18892 (r4R2/4QN1K/5NR1/8/1p6/q3Pk1p/3r1n1p/4BB1n w - - 0 1)

Mansfield, Comins

3rd Prize, Chess, 1959

r4R2/4QN1K/5NR1/8/1p6/q3Pk1p/3r1n1p/4BB1n

#2

9 + 9

3550 Complete Mansfield/II 1997
56 The Problemist 2013

SOLUTION

  • SOUND
  • Sets
    • 1...Sg3
      • 2.Sg5#
    • 1...Sd1
      • 2.Sg5#
      • 2.Qe4#
    • 1...Sd3
      • 2.Sg5#
      • 2.Qe4#
    • 1...Se4
      • 2.Qxe4#
    • 1...Sg4
      • 2.Sg5#
      • 2.Qe4#
  • Tries
    • 1.Rg3+?
      • 1...Sxg3
        • 2.Sg5#
      • 1...Kxg3!
    • 1.Qe5?
      • threat
        • 2.Sg5#
        • 2.Qf4#
      • 1...Se4
        • 2.Qf4#
        • 2.Qxe4#
      • 1...Qa7
        • 2.Qf4#
      • 1...Rd4
        • 2.Sg5#
      • 1...Rd7
        • 2.Qf4#
      • 1...Ra7
        • 2.Qf4#
      • 1...Sd3
        • 2.Sg5#
        • 2.Qe4#
      • 1...Qxe3!
  • Keys
    • 1.Sg4!
      • threat
        • 2.Sxh2#
      • 1...Kg3
        • 2.Sge5#
      • 1...Qxe3
        • 2.Qxe3#
      • 1...Sxg4
        • 2.Sg5#
      • 1...Sd1
        • 2.Sd8#
      • 1...Sd3
        • 2.Qb7#
      • 1...Se4
        • 2.Sfe5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 5
    • REMOVED MATES = 1
  • Sets
    • S(a);SBLOCK::S(G)
    • S(c);N_GUARD::QAB1(F),XS(c)
  • Tries
    • Try
      • R(E);CHECK
      • Vars
        • S(a);SBLOCK,XR(E)::S(G)
      • Refutation
        • K(f);P-FLIGHT,P_SPINS(c),XR(E)
    • Try
      • Q(F);
      • Threat
        • DUALS(2)
      • Vars
        • Q(e);P_PINS(G)::QAR1(F)
        • R(b);::S(G)
        • R(b);P_PINS(G)::QAR1(F)
        • R(i);P_PINS(G)::QAR1(F)
      • Refutation
        • Q(e);XP(C)
  • Actual
    • S(D);
    • Threat
      • S(D),XP(d)
    • Vars
      • K(f);P-FLIGHT,P_SPINS(c)::R(E)+S(D)
      • Q(e);OGATE,XP(C)::QAR1(F),XQ(e)
      • S(c);SBLOCK,XS(D)::R(I)+S(G),DCHECK
      • S(c);::R(I)+S(G)
      • S(c);N_GUARD,S_CUTR(b)::QAB(F)
      • S(c);SBLOCK::R(I)+S(G),DCHECK
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