MESON Chess Problem Database

Problem Display
PID: 198301 (8/3R4/2n5/8/2r1pK1B/1B2Qn2/N1PN2p1/2qk1rR1 w - - 0 1)

White, Alain Campbell

Rivista del Club Argentino de Ajedrez, 1920

8/3R4/2n5/8/2r1pK1B/1B2Qn2/N1PN2p1/2qk1rR1

#2

9 + 8

6490 yacpdb 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Qxd2
      • 2.c3#
    • 1...Qa1
      • 2.c3#
    • 1...Rxc2
      • 2.Sc3#
    • 1...Rc3
      • 2.Sxc3#
    • 1...Ra4
      • 2.Sc3#
    • 1...Rb4
      • 2.Sc3#
    • 1...Rd4
      • 2.Sc3#
  • Tries
    • 1.Sxf1+?
      • 1...Qd2
        • 2.c3#
      • 1...Rd4
        • 2.Sc3#
      • 1...Sd2
        • 2.Sxd2#
        • 2.Sh2#
        • 2.Sg3#
        • 2.Qe1#
      • 1...Sfd4
        • 2.Sd2#
        • 2.Sh2#
        • 2.Sg3#
      • 1...Scd4!
    • 1.Sxf3+?
      • 1...Qd2
        • 2.Rxd2#
        • 2.Qxd2#
        • 2.c3#
      • 1...Rd4
        • 2.Sc3#
      • 1...Sd4!
  • Keys
    • 1.Sxe4+!
      • 1...Qd2
        • 2.c3#
      • 1...Rd4
        • 2.Sc3#
      • 1...Sd2+
        • 2.Qf3#
      • 1...Sfd4+
        • 2.Sf2#
      • 1...Scd4
        • 2.Sf2#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 5
  • Sets
    • Q(a);N_GUARD,P_PINQ(F),P_SPINQ(a),XS(D)::B(E)+P(C)
    • Q(a);N_GUARD::B(E)+P(C)
    • R(f);N_GUARD,XP(C)::S(B)
    • R(f);N_GUARD::S(B),XR(f)
    • R(f);N_GUARD::S(B)
  • Tries
    • Try
      • S(D);CHECK,P_SPINQ(F),XR(c)
      • Vars
        • Q(a);P_SPINQ(a)::B(E)+P(C)
        • R(f);P_SPINR(f)::S(B)
      • Refutation
        • S(h);P_SPINS(h)
    • Try
      • S(D);CHECK,P_SPINQ(F),P_SPINS(D),XS(e)
      • Vars
        • R(f);::S(B)
      • Refutation
        • S(h);P_SPINS(h)
  • Actual
    • S(D);CHECK,P_SPINQ(F),P_SPINS(D),XP(g)
    • Vars
      • Q(a);P_SPINQ(a)::B(E)+P(C)
      • R(f);::S(B)
      • S(e);CHECK,N_PINQ(F),P_SPINS(e)::QAB(F)
      • S(e);CHECK,N_PINS(D),P_SPINS(e)::S(D)
      • S(h);N_PINS(D),P_SPINS(h)::S(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).