MESON Chess Problem Database

Problem Display
PID: 68339 (B6B/1r1Q1N1K/b2p2pp/2pkpn2/1PR4p/N1P5/4R2b/5rq1 w - - 0 1)

Vaughan, Colin V

1st Prize, Chess, 1949

B6B/1r1Q1N1K/b2p2pp/2pkpn2/1PR4p/N1P5/4R2b/5rq1

#2

10 + 13

81 Chess 1950
6388 ChessMoves 2006
56 The Problemist 2013

SOLUTION

  • SOUND
  • Sets
    • 1...Qh1
      • 2.Rxc5#
    • 1...Qg2
      • 2.Rxc5#
    • 1...Qg3
      • 2.Rxc5#
    • 1...Qg4
      • 2.Rxc5#
    • 1...Qg5
      • 2.Rxc5#
    • 1...Rf2
      • 2.Rxc5#
    • 1...Rf4
      • 2.Rxe5#
    • 1...Bxc4
      • 2.Bxb7#
    • 1...Se3
      • 2.Rd2#
      • 2.Qxd6#
    • 1...Sg3
      • 2.Rxe5#
      • 2.Qxd6#
    • 1...Sd4
      • 2.Rxc5#
      • 2.Qxd6#
    • 1...Se7
      • 2.Qxd6#
    • 1...Sg7
      • 2.Qxd6#
  • Tries
    • 1.Qxb7+?
      • 1...Ke6
        • 2.Sd8#
      • 1...Bxb7!
  • Keys
    • 1.Sd8!
      • threat
        • 2.Qf7#
      • 1...Se3
        • 2.Rd2#
      • 1...Sg3
        • 2.Rxe5#
      • 1...Sd4
        • 2.Rxc5#
      • 1...Se7
        • 2.Qe6#
      • 1...Sg7
        • 2.Qc6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 3
    • REMOVED MATES = 8
  • Sets
    • Q(b);N_GUARD::R1(E),XP(e)
    • R(a);S_CUTQ(b)::R1(E),XP(e)
    • R(a);S_CUTB(c)::R1(A),XP(g)
    • B(i);N_GUARD,XR(E)::B(I),XR(m)
    • S(h);N_GUARD::QAR1(F),XP(j)
  • Tries
    • Try
      • Q(F);CHECK,N_PINP(j),XR(m)
      • Vars
        • K(f);P_SPINP(g),S_FLIGHT::S(G)
      • Refutation
        • B(i);P_SPINB(i),XQ(F)
  • Actual
    • S(G);P_SPINQ(F)
    • Threat
      • QAB(F)
    • Vars
      • S(h);N_GUARD,S_CUTQ(b)::R(A)
      • S(h);S_CUTB(c)::R1(A),XP(g)
      • S(h);S_CUTQ(b)::R1(E),XP(e)
      • S(h);N_PINQ(F)::QAB1(F)
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