MESON Chess Problem Database

Problem Display
PID: 268562 (5RQ1/8/8/1N2pP2/B1nPkP1p/4n2P/2p1P1P1/2B1K3 w - - 0 1)

Shannon, J

British Chess Magazine, 1934

5RQ1/8/8/1N2pP2/B1nPkP1p/4n2P/2p1P1P1/2B1K3

#2

12 + 6

SOLUTION

  • SOUND
  • Sets
    • 1...Kxf4
      • 2.Qg4#
    • 1...Sd1
      • 2.Bxc2#
    • 1...Sf1
      • 2.Bxc2#
    • 1...Sxg2+
      • 2.Qxg2#
    • 1...Sg4
      • 2.Bxc2#
    • 1...Sd5
      • 2.Bxc2#
    • 1...Sxf5
      • 2.Bxc2#
  • Tries
    • 1.Sc3+?
      • 1...Kxf4
        • 2.Qg4#
      • 1...Kxd4!
    • 1.Bxc2+?
      • 1...Kxf4
        • 2.Qg4#
      • 1...Sxc2+!
  • Keys
    • 1.Qg7!
      • 1...Sxg2+
        • 2.Qxg2#
      • 1...Kxf4
        • 2.Qg4#
      • 1...Kd5
        • 2.Qb7#
      • 1...Sxf5
        • 2.Qb7#
      • 1...exd4
        • 2.Qxd4#
      • 1...exf4
        • 2.Sc3#
      • 1...Sd1
        • 2.Qb7#
      • 1...Sf1
        • 2.Qb7#
      • 1...Sg4
        • 2.Qb7#
      • 1...Sd5
        • 2.Bxc2#
      • 1...Sb2
        • 2.Qxe5#
      • 1...Sd2
        • 2.Qxe5#
      • 1...Sa3
        • 2.Qxe5#
      • 1...Sa5
        • 2.Qxe5#
      • 1...Sb6
        • 2.Qxe5#
      • 1...Sd6
        • 2.Qxe5#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 4
    • ADDED MATES = 9
    • REMOVED MATES = 0
  • Sets
    • K(d);OGATEB,P-FLIGHT,P_SPINS(b),XP(H)::QAR1(L)
    • S(b);N_GUARD::B(F),XP(a)
    • S(b);CHECK,OGATE,XP(D)::QAB(L),XS(b)
    • S(b);N_GUARD,XP(J)::B(F),XP(a)
  • Tries
    • Try
      • S(I);CHECK
      • Vars
        • K(d);N_GUARD,P-FLIGHT,P_SPINS(b),XP(H)::QAR1(L)
      • Refutation
        • K(d);P-FLIGHT,XP(G)
    • Try
      • B(F);CHECK,XP(a)
      • Vars
        • K(d);N_GUARD,P-FLIGHT,P_SPINS(b),XP(H)::QAR1(L)
      • Refutation
        • S(b);CHECK,XB(F)
  • Actual
    • Q(L);
    • Vars
      • S(b);CHECK,OGATE,XP(D)::QAB(L),XS(b)
      • K(d);OGATEB,P-FLIGHT,P_SPINS(b),XP(H)::QAR1(L)
      • K(d);N_GUARD,S_CUTS(b),S_FLIGHT::QAB(L)
      • S(b);N_GUARD,XP(J)::QAB(L)
      • P(f);OGATE,XP(G)::QAR1(L),XP(f)
      • P(f);SBLOCK,XP(H)::S(I)
      • S(b);N_GUARD::QAB(L)
      • S(b);N_GUARD,SBLOCK::B(F),XP(a)
      • S(c);N_GUARD::QAR1(L),XP(f)
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).