MESON Chess Problem Database

Problem Display
PID: 148725 (1bBrn3/3rp2N/R1p1k3/1p2N3/pQ2P3/6B1/3p4/3K4 w - - 0 1)

Allison, Christopher John

2nd Prize, Chess, 1957

1bBrn3/3rp2N/R1p1k3/1p2N3/pQ2P3/6B1/3p4/3K4

#2

8 + 10

81 Chess 1958
56 The Problemist 2012
15148 Sadier Collection 2014

SOLUTION

  • SOUND
  • Sets
    • 1...Sf6
      • 2.Sg5#
    • 1...Sc7
      • 2.Rxc6#
  • Tries
    • 1.Sxc6?
      • threat
        • 2.Sxd8#
        • 2.Qxe7#
      • 1...Rxc8
        • 2.Sd8#
      • 1...Bxg3
        • 2.Qxe7#
      • 1...Bf4
        • 2.Qxe7#
      • 1...Bd6
        • 2.Sxd8#
      • 1...Sd6
        • 2.Sxd8#
      • 1...Kf7!
    • 1.Qb3+?
      • 1...Kd6
        • 2.Rxc6#
      • 1...axb3!
    • 1.Qc4+?
      • 1...Kd6
        • 2.Sf7#
        • 2.Rxc6#
        • 2.Qxc6#
      • 1...bxc4!
  • Keys
    • 1.Qxd2!
      • threat
        • 2.Qd5#
      • 1...Rxc8
        • 2.Qxd7#
      • 1...Bd6
        • 2.Qa2#
      • 1...Sd6
        • 2.Qh6#
      • 1...Sf6
        • 2.Sg5#
      • 1...Sc7
        • 2.Rxc6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • S(j);SBLOCK::S(G)
    • S(j);N_GUARD,S_CUTB(h)::R(F),XP(d)
  • Tries
    • Try
      • S(E);XP(d)
      • Threat
        • DUALS(2)
      • Vars
        • R(i);N_SPINR(f),XB(H)::R(F)+S(E),DCHECK
        • B(h);XB(B)::QAR1(C),XP(g)
        • B(h);::QAR1(C),XP(g)
        • B(h);::S(E),XR(i)
        • S(j);::S(E),XR(i)
      • Refutation
        • K(e);N_SPINR(f),S_FLIGHT
    • Try
      • Q(C);CHECK
      • Vars
        • K(e);N_SPINR(f),P-FLIGHT::R1(F),XP(d)
      • Refutation
        • P(b);XQ(C)
    • Try
      • Q(C);CHECK
      • Refutation
        • P(c);XQ(C)
  • Actual
    • Q(C);P_SPINQ(C),XP(a)
    • Threat
      • QAB1(C)
    • Vars
      • R(i);N_GUARD,N_SPINR(f),XB(H)::QAB1(C),XR(f)
      • B(h);N_PINQ(C),N_SPINP(d),SBLOCK::QAB(C)
      • S(j);N_PINQ(C),N_SPINP(d),SBLOCK::QAR(C)
      • S(j);SBLOCK::S(G)
      • S(j);N_GUARD,S_CUTB(h)::R(F),XP(d)
HTML5 logo

Developed and maintained by Brian Stephenson.
Implemented with HTML5, MySQL, Perl (with, inter alia, CGI::Simple, HTML::Template & XML::LibXML) & CSS/Javascript (jQuery, Bootstrap & DataTables).