MESON Chess Problem Database

Problem Display
PID: 229883 (2n4q/p3p3/K3R1Q1/N1pN4/2BkP3/n3R3/2b1p3/4b3 w - - 0 1)

Schonholzer, Andreas

Schweizerische Schachzeitung, 1986

2n4q/p3p3/K3R1Q1/N1pN4/2BkP3/n3R3/2b1p3/4b3

#2

8 + 10

SOLUTION

  • SOUND
  • Sets
    • 1...Qg7
      • 2.Qxg7#
    • 1...Qh1
      • 2.Qg7#
    • 1...Qh3
      • 2.Qg7#
    • 1...Qd8
      • 2.Qg7#
    • 1...Qe8
      • 2.Qg7#
    • 1...Bd1
      • 2.Rd3#
    • 1...Bb3
      • 2.Rd3#
    • 1...Bd3
      • 2.Rxd3#
    • 1...Ba4
      • 2.Rd3#
    • 1...Bxe4
      • 2.R3xe4#
      • 2.R6xe4#
      • 2.Qxe4#
    • 1...Sxc4
      • 2.Sc6#
  • Tries
    • 1.Qg1?
      • threat
        • 2.Rd3#
      • 1...Bxa5
        • 2.Rc3#
      • 1...Sxc4
        • 2.Sc6#
      • 1...Bf2
        • 2.Qa1#
      • 1...Bd3
        • 2.Rxd3#
      • 1...Qe5!
  • Keys
    • 1.Rc3!
      • threat
        • 2.Sc6#
      • 1...Bxc3
        • 2.Qg1#
      • 1...Qe8
        • 2.Qg7#
      • 1...Ba4
        • 2.Rd3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 8
  • Sets
    • Q(j);N_GUARD::QAB(H),XQ(j)
    • Q(j);N_GUARD::QAB(H)
    • B(b);N_GUARD::R1(A)
    • B(b);N_GUARD,P_PINB(B)::R1(A),XB(b)
    • S(d);SBLOCK,XB(B)::S(D)
  • Tries
    • Try
      • Q(H);
      • Threat
        • QAB(H)+R(A),DCHECK
      • Vars
        • B(a);N_GUARD,XS(D)::QAB(H)+R(A)
        • S(d);SBLOCK,XB(B)::S(D)
        • B(a);OGATE::QAB(H)
        • B(b);P_PINB(B)::QAB(H)+R(A),DCHECK,XB(b)
      • Refutation
        • Q(j);
  • Actual
    • R(A);
    • Threat
      • S(D)
    • Vars
      • B(a);N_GUARD,XR(A)::QAB(H)
      • Q(j);N_GUARD::QAB(H)
      • B(b);N_GUARD::R1(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).