MESON Chess Problem Database

Problem Display
PID: 79799 (4N1BQ/5b2/4PR2/2KNk3/2P5/2RPPn2/6q1/B6r w - - 0 1)

Boyer, Jean-Pierre

The Problemist, 1977

4N1BQ/5b2/4PR2/2KNk3/2P5/2RPPn2/6q1/B6r

#2

12 + 5

SOLUTION

  • SOUND
  • Sets
    • 1...Se1
      • 2.Rc2#
    • 1...Sg1
      • 2.Rc2#
    • 1...Sd2
      • 2.Rc1#
    • 1...Sd4
      • 2.exd4#
  • Tries
    • 1.Rc1+?
      • 1...Sd4
        • 2.Bxd4#
        • 2.exd4#
      • 1...Qb2!
    • 1.Rc2+?
      • 1...Sd4
        • 2.Bxd4#
        • 2.exd4#
      • 1...Rxa1!
    • 1.Rg6+?
      • 1...Kf5
        • 2.Se7#
        • 2.Qf6#
      • 1...Rxh8!
    • 1.d4+?
      • 1...Ke4
        • 2.Sd6#
        • 2.Rf4#
      • 1...Sxd4!
  • Keys
    • 1.Se7!
      • threat
        • 2.Sc6#
      • 1...Bxe8
        • 2.Rf5#
      • 1...Se1
        • 2.Rc2#
      • 1...Sg1
        • 2.Rc2#
      • 1...Sd2
        • 2.Rc1#
      • 1...Sh2
        • 2.Rg6#
      • 1...Sd4
        • 2.exd4#
      • 1...Sh4
        • 2.Rg6#
      • 1...Sg5
        • 2.Rh6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • S(c);N_GUARD,S_CUTR(a)::B(A)+R(B)
    • S(c);N_GUARD,S_CUTQ(b)::B(A)+R(B)
    • S(c);OGATE::P(D),XS(c)
  • Tries
    • Try
      • R(B);CHECK
      • Refutation
        • Q(b);P_SPINQ(b)
    • Try
      • R(B);CHECK
      • Refutation
        • R(a);XB(A)
    • Try
      • R(I);CHECK
      • Refutation
        • R(a);XQ(L)
    • Try
      • P(C);CHECK
      • Refutation
        • S(c);XP(C)
  • Actual
    • S(G);
    • Threat
      • S(G)
    • Vars
      • B(e);XS(J)::QAB(L)+R(I),DCHECK
      • S(c);N_GUARD,S_CUTR(a)::B(A)+R(B)
      • S(c);N_GUARD,S_CUTQ(b)::B(A)+R(B)
      • S(c);S_CUTR(a)::QAB(L)+R(I)
      • S(c);OGATE::P(D),XS(c)
      • S(c);S_CUTQ(b)::QAB(L)+R(I)
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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).