MESON Chess Problem Database

Problem Display
PID: 264227 (6NK/2p2p2/5pkp/5n1p/7P/1rR5/rR4p1/3Q4 w - - 0 1)

Parrinello, Mario

Simoni, Francesco

Comm., Bournemouth, 1989

6NK/2p2p2/5pkp/5n1p/7P/1rR5/rR4p1/3Q4

#2

6 + 10

15601 Albrecht-Leiss-Degener Collection 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Se3
      • 2.Se7#
    • 1...Sg3
      • 2.Se7#
    • 1...Sd4
      • 2.Se7#
    • 1...Sd6
      • 2.Se7#
    • 1...Se7
      • 2.Sxe7#
    • 1...Sg7
      • 2.Se7#
  • Tries
    • 1.Rxg2+?
      • 1...Sg3
        • 2.Se7#
      • 1...Rxg2!
    • 1.Rg3+?
      • 1...Sxg3
        • 2.Se7#
      • 1...Rxg3!
    • 1.Qc2?
      • threat
        • 2.Se7#
      • 1...Rb8
        • 2.Rg3#
      • 1...Ra8!
    • 1.Qd3?
      • threat
        • 2.Se7#
      • 1...Ra8
        • 2.Rxg2#
      • 1...Rb8!
  • Keys
    • 1.Qb1!
      • threat
        • 2.Se7#
      • 1...Ra8
        • 2.Rxg2#
      • 1...Rb8
        • 2.Rg3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 6
  • Sets
    • S(d);N_GUARD::S(E)
    • S(d);N_GUARD::S(E),XS(d)
  • Tries
    • Try
      • R(B);CHECK,XP(b)
      • Vars
        • S(d);P_SPINS(d)::S(E)
      • Refutation
        • R(a);XR(B)
    • Try
      • R(C);CHECK
      • Vars
        • S(d);XR(C)::S(E)
      • Refutation
        • R(c);XR(C)
    • Try
      • Q(A);P_PINS(d)
      • Threat
        • S(E)
      • Vars
        • R(c);N_GUARD,P_PINS(E)::R(C)
      • Refutation
        • R(a);P_PINS(E)
    • Try
      • Q(A);P_PINS(d)
      • Threat
        • S(E)
      • Vars
        • R(a);N_GUARD,P_PINS(E)::R(B),XP(b)
      • Refutation
        • R(c);P_PINS(E)
  • Actual
    • Q(A);P_PINS(d)
    • Threat
      • S(E)
    • Vars
      • R(a);N_GUARD,P_PINS(E)::R(B),XP(b)
      • R(c);N_GUARD,P_PINS(E)::R(C)
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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).