MESON Chess Problem Database

Problem Display
PID: 234845 (8/2K5/8/2k2N1R/P7/PB2N3/1Pp2r2/2R5 w - - 0 1)

Groeneveld, Cornelis

Freie Presse, 1983

8/2K5/8/2k2N1R/P7/PB2N3/1Pp2r2/2R5

#2

9 + 3

5454 Near Snap 2021
15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Rf1
      • 2.Rxc2#
    • 1...Rf3
      • 2.Rxc2#
  • Tries
    • 1.Sd4+?
      • 1...Rf5
        • 2.Se6#
      • 1...Kxd4!
    • 1.Sg7+?
      • 1...Rf5
        • 2.Se6#
      • 1...Kd4!
    • 1.Bxc2?
      • threat
        • 2.b4#
      • 1...Rf4
        • 2.Be4#
      • 1...Rxf5!
  • Keys
    • 1.Sxc2!
      • 1...Rxc2
        • 2.Rxc2#
      • 1...Rxf5
        • 2.Rxf5#
      • 1...Rd2
        • 2.Sfd4#
      • 1...Rf1
        • 2.Se1#
      • 1...Re2
        • 2.Sfe3#
      • 1...Rg2
        • 2.Sg3#
      • 1...Rh2
        • 2.Sh4#
      • 1...Rf3
        • 2.Sce3#
      • 1...Rf4
        • 2.Scd4#

Anticipated by 194011(1917)

This anticipates 7745(1993)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 2
    • ADDED MATES = 7
    • REMOVED MATES = 0
  • Sets
    • R(b);N_GUARD::R(A),XP(a)
  • Tries
    • Try
      • S(G);CHECK
      • Vars
        • R(b);P_SPINR(b)::S(G)
      • Refutation
        • K(c);N_SPINP(a),S_FLIGHT,XS(G)
    • Try
      • S(G);CHECK
      • Vars
        • R(b);P_SPINR(b)::S(G)
      • Refutation
        • K(c);N_SPINP(a),S_FLIGHT
    • Try
      • B(D);XP(a)
      • Threat
        • P(B)
      • Vars
        • R(b);N_GUARD::R(A)+B(D)
      • Refutation
        • R(b);P_SPINR(b),XS(G)
  • Actual
    • S(E);XP(a)
    • Vars
      • R(b);OGATE,P_SPINR(b),XS(E)::R(A),XR(b)
      • R(b);OGATE,P_SPINR(b),XS(G)::R(H),XR(b)
      • R(b);N_GUARD::R(H)+S(G)
      • R(b);N_GUARD::R(A)+S(E)
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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).