MESON Chess Problem Database

Problem Display
PID: 7391 (4B3/3NKpp1/PPRN1pP1/pqrk1p2/bp6/1p1p1P2/1B1P4/4Q3 w - - 0 1)

Neyndorff, Luke

StrateGems, 1999

4B3/3NKpp1/PPRN1pP1/pqrk1p2/bp6/1p1p1P2/1B1P4/4Q3

#2

12 + 12

SOLUTION

  • SOUND
  • Sets
    • 1...Qxa6
      • 2.Rxc5#
    • 1...Qxc6
      • 2.Bxf7#
    • 1...Qxb6
      • 2.Sxb6#
    • 1...Rxc6
      • 2.Bxf7#
    • 1...f4
      • 2.Qe4#
  • Tries
    • 1.Sxf5?
      • threat
        • 2.Qe4#
      • 1...Kc4
        • 2.Se3#
        • 2.Bxf7#
        • 2.Qe4#
      • 1...Qc4
        • 2.Rd6#
      • 1...Rc4
        • 2.Rd6#
      • 1...Kxc6!
    • 1.Qe6+?
      • 1...Kxc6
        • 2.Sxf7#
      • 1...fxe6!
  • Keys
    • 1.Sc4!
      • 1...Kxc4
        • 2.Bxf7#
      • 1...Kxc6
        • 2.Sxf6#
      • 1...Qxc4
        • 2.Rd6#
      • 1...Qxa6
        • 2.Rxc5#
      • 1...Qxc6
        • 2.Se3#
      • 1...Qxb6
        • 2.Sdxb6#
      • 1...Rxc4
        • 2.Rd6#
      • 1...Rxc6
        • 2.Se3#
      • 1...fxg6
        • 2.Qe6#
      • 1...f4
        • 2.Qe4#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 2
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
    • Q(f);N_GUARD,XP(E)::R1(G),XR(g)
    • Q(f);SBLOCK,XR(G)::B(L),XP(k)
    • Q(f);XP(F)::S(J),XQ(f)
    • R(g);SBLOCK,XR(G)::B(L),XP(k)
    • P(i);N_GUARD::QAB1(A)
  • Tries
    • Try
      • S(H);XP(i)
      • Threat
        • QAB1(A)
      • Vars
        • Q(f);SBLOCK::R1(G)
        • R(g);SBLOCK::R1(G)
      • Refutation
        • K(h);S_FLIGHT,XR(G)
    • Try
      • Q(A);CHECK
      • Vars
        • K(h);S_FLIGHT,XR(G)::QAR(A)+S(H),XP(k)
      • Refutation
        • P(k);XQ(A)
  • Actual
    • S(H);
    • Vars
      • K(h);P_SPINR(g),S_FLIGHT,XS(H)::B(L),XP(k)
      • K(h);S_FLIGHT,XR(G)::B(L)+S(J),XP(j)
      • Q(f);SBLOCK,XS(H)::R1(G)
      • Q(f);N_GUARD,XP(E)::R1(G),XR(g)
      • Q(f);SBLOCK,XR(G)::S(H)
      • Q(f);XP(F)::S(J),XQ(f)
      • R(g);SBLOCK,XS(H)::R1(G)
      • R(g);SBLOCK,XR(G)::S(H)
      • P(k);N_GUARD,XP(I)::QAB1(A)
      • P(i);N_GUARD::QAB1(A)
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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).