MESON Chess Problem Database

Problem Display
PID: 96715 (2K5/2p2N2/3Rpr2/1p4B1/3Nk1P1/1Q6/2b1pq2/4n3 w - - 0 1)

Steiner, Paul

US Problem Bulletin, 1993

2K5/2p2N2/3Rpr2/1p4B1/3Nk1P1/1Q6/2b1pq2/4n3

#2

7 + 9

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qe3
      • 2.Qxe3#
    • 1...Qh4
      • 2.Qe3#
    • 1...Qf1
      • 2.Qe3#
    • 1...Qg2
      • 2.Qe3#
    • 1...Qh2
      • 2.Qe3#
    • 1...Qf5
      • 2.Qe3#
    • 1...Sg2
      • 2.Qxc2#
    • 1...Sf3
      • 2.Qxc2#
  • Tries
    • 1.Qxc2+?
      • 1...Sd3
        • 2.Qc6#
      • 1...Sxc2!
  • Keys
    • 1.Sf3!
      • threat
        • 2.Sd2#
      • 1...Qxf3
        • 2.Qb4#
      • 1...Rxf3
        • 2.Qxe6#
      • 1...Rxf7
        • 2.Rxe6#
      • 1...Sxf3
        • 2.Qxc2#
      • 1...cxd6
        • 2.Sxd6#
      • 1...Qe3
        • 2.Qxe3#
      • 1...Qd4
        • 2.Rxd4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 6
  • Sets
    • Q(d);N_GUARD::QAR1(A),XQ(d)
    • Q(d);N_GUARD::QAR1(A)
    • S(a);N_GUARD::QAB(A),XB(b)
  • Tries
    • Try
      • Q(A);CHECK,XB(b)
      • Vars
        • S(a);P_SPINS(a),SBLOCK::QAB(A)
      • Refutation
        • S(a);XQ(A)
  • Actual
    • S(B);
    • Threat
      • S(B)
    • Vars
      • Q(d);N_GUARD,SBLOCK,XS(B)::QAR(A)
      • R(h);N_GUARD,SBLOCK,XS(B)::QAR2(A),XP(g)
      • R(h);N_GUARD,XS(F)::R(E),XP(g)
      • S(a);N_GUARD,SBLOCK,XS(B)::QAB(A),XB(b)
      • P(i);XR(E)::S(F),XP(i)
      • Q(d);N_GUARD::QAR1(A),XQ(d)
      • Q(d);N_GUARD::R1(E),XQ(d)
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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).