MESON Chess Problem Database

Problem Display
PID: 225116 (8/1pN2K2/8/1Bn1P1N1/3kP3/6Q1/3B2n1/b7 w - - 0 1)

Ellerman, Arnoldo

US Problem Bulletin, 1965

8/1pN2K2/8/1Bn1P1N1/3kP3/6Q1/3B2n1/b7

#2

8 + 5

SOLUTION

  • SOUND
  • Sets
    • 1...Bc3
      • 2.Bxc3#
      • 2.Qxc3#
    • 1...Sb3
      • 2.Sce6#
    • 1...Sd3
      • 2.Sce6#
    • 1...Sa4
      • 2.Sce6#
    • 1...Sxe4
      • 2.Sge6#
    • 1...Sa6
      • 2.Sce6#
    • 1...Se6
      • 2.Scxe6#
    • 1...Sd7
      • 2.Sce6#
  • Tries
    • 1.Qf2+?
      • 1...Kxe5
        • 2.Qxc5#
        • 2.Qf6#
      • 1...Se3!
    • 1.Qd3+?
      • 1...Kxe5
        • 2.Sf3#
        • 2.Qd5#
      • 1...Sxd3!
    • 1.Qe3+?
      • 1...Kxe5
        • 2.Qxc5#
      • 1...Sxe3!
  • Keys
    • 1.Qa3!
      • threat
        • 2.Qxa1#
      • 1...Kxe5
        • 2.Qxc5#
      • 1...Sxe4
        • 2.Sf3#
      • 1...Bb2
        • 2.Qxb2#
      • 1...Bc3
        • 2.Qxc3#
      • 1...Sb3
        • 2.Qd6#
      • 1...Sd3
        • 2.Qd6#
      • 1...Sa4
        • 2.Qd6#
      • 1...Sa6
        • 2.Qd6#
      • 1...Se6
        • 2.Qd6#
      • 1...Sd7
        • 2.Qd6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 7
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • S(d);N_GUARD::S(G)
    • S(d);N_GUARD,SBLOCK,XP(C)::S(F)
    • S(d);N_GUARD::S(G),XS(d)
  • Tries
    • Try
      • Q(B);CHECK
      • Refutation
        • S(b);P_SPINS(b)
    • Try
      • Q(B);CHECK
      • Refutation
        • S(d);XQ(B)
    • Try
      • Q(B);CHECK
      • Vars
        • K(c);OGATE,S_FLIGHT,XP(E)::QAR2(B),XS(d)
      • Refutation
        • S(b);XQ(B)
  • Actual
    • Q(B);
    • Threat
      • QAB(B),XB(a)
    • Vars
      • K(c);S_FLIGHT,XP(E)::QAR2(B),XS(d)
      • S(d);SBLOCK,XP(C)::S(F)
      • B(a);N_GUARD::QAB(B),XB(a)
      • B(a);N_GUARD::QAB1(B),XB(a)
      • S(d);OGATE::QAR2(B)
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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).