MESON Chess Problem Database

Problem Display
PID: 145351 (bqn5/4RpPK/r1Q2N2/p4k1p/r1n4R/p3pN2/2Pp2P1/bB6 w - - 0 1)

Smedley, Don A

2nd Prize, The Problemist, 1977/II

bqn5/4RpPK/r1Q2N2/p4k1p/r1n4R/p3pN2/2Pp2P1/bB6

#2

10 + 14

4258 Brian Harley Award 1977-1978
56 The Problemist 1980
56 The Problemist 2013

SOLUTION

  • SOUND
  • Sets
    • 1...Qh2
      • 2.c3#
    • 1...Qg3
      • 2.c3#
    • 1...Qa7
      • 2.c3#
    • 1...Qc7
      • 2.c3#
    • 1...Qb3
      • 2.cxb3#
    • 1...Bb2
      • 2.c3#
    • 1...Bb7
      • 2.c3#
    • 1...S4b6
      • 2.c4#
    • 1...S8b6
      • 2.c3#
  • Tries
    • 1.Qe4+?
      • 1...Kxf6
        • 2.g8S#
      • 1...Bxe4!
    • 1.Qd7+?
      • 1...Kxf6
        • 2.Rxf7#
        • 2.g8S#
      • 1...Re6!
    • 1.g4+?
      • 1...Kf4
        • 2.Sxh5#
      • 1...hxg4!
    • 1.g8Q?
      • threat
        • 2.Qg5#
      • 1...Qg3
        • 2.Qgxc8#
        • 2.c3#
      • 1...Qf4
        • 2.Qgxc8#
      • 1...Bxf6!
  • Keys
    • 1.Sxh5!
      • threat
        • 2.g4#
      • 1...Qg3
        • 2.Sxg3#
        • 2.c3#
      • 1...Qf4
        • 2.Rxf4#
      • 1...Sb2
        • 2.Rxf7#
      • 1...Se5
        • 2.Sg3#
      • 1...S4b6
        • 2.c4#
      • 1...S4d6
        • 2.Qd7#

There are these versions: 55059

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 8
  • Sets
    • Q(m);N_GUARD::B(A)+P(B)
    • Q(m);OGATE::B(A)+P(B),XQ(m)
    • B(a);S_CUTQ(m)::B(A)+P(B)
    • B(l);S_CUTQ(m)::B(A)+P(B)
    • S(f);OGATE::B(A)+P(B)
    • S(n);S_CUTQ(m)::B(A)+P(B)
  • Tries
    • Try
      • Q(F);CHECK
      • Vars
        • K(h);P-FLIGHT,XS(G)::P=S
      • Refutation
        • B(l);XQ(F)
    • Try
      • Q(F);CHECK
      • Refutation
        • R(j);P_SPINR(j)
    • Try
      • P(C);CHECK
      • Vars
        • K(h);P-FLIGHT::S(G),XP(i)
      • Refutation
        • P(i);XP(C)
    • Try
      • P(I);
      • Threat
        • QAR1(I)
      • Vars
        • Q(m);N_GUARD::QAB(I),XS(n)
      • Refutation
        • B(a);XS(G)
  • Actual
    • S(G);XP(i)
    • Threat
      • P(C)
    • Vars
      • Q(m);N_GUARD::R1(E),XQ(m)
      • S(f);S_CUTB(a)::R(H),XP(k)
      • S(f);S_CUTQ(m)::S(G)
      • S(f);OGATE::B(A)+P(B)
      • S(f);S_CUTR(j)::QAB(F)
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