MESON Chess Problem Database

Problem Display
PID: 77245 (8/8/4p2Q/3b4/8/2n5/pN2p3/r3k1KR w - - 0 1)

Pape, Edouard

3rd HM., Good Companions, 1920

8/8/4p2Q/3b4/8/2n5/pN2p3/r3k1KR

#2

4 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Bg2
      • 2.Kxg2#
    • 1...Bb3
      • 2.Kg2#
    • 1...Bc4
      • 2.Kg2#
    • 1...Sb1
      • 2.Qc1#
    • 1...Sd1
      • 2.Sd3#
    • 1...Se4
      • 2.Kg2#
  • Tries
    • 1.Qc1+?
      • 1...Sd1
        • 2.Sd3#
      • 1...Rxc1!
  • Keys
    • 1.Sc4!
      • threat
        • 2.Qd2#
      • 1...Kd1
        • 2.Qd2#
      • 1...Bxc4
        • 2.Kg2#
      • 1...Rd1
        • 2.Qh4#
      • 1...Sb1
        • 2.Qc1#
      • 1...Se4
        • 2.Kg2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 3
  • Sets
    • B(f);::R(B)+K(A),XB(f)
    • B(f);::R(B)+K(A)
    • S(e);N_GUARD,S_CUTR(a)::QAR2(D)
    • S(e);SBLOCK::S(C)
    • S(e);::R(B)+K(A)
  • Tries
    • Try
      • Q(D);CHECK
      • Vars
        • S(e);P_SPINS(e)::S(C)
      • Refutation
        • R(a);XQ(D)
  • Actual
    • S(C);
    • Threat
      • QAB1(D)
    • Vars
      • K(b);P-FLIGHT::QAR1(D)
      • B(f);XS(C)::R(B)+K(A)
      • R(a);SBLOCK::QAB(D)
      • S(e);N_GUARD,S_CUTR(a)::QAR2(D)
      • S(e);::R(B)+K(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).