MESON Chess Problem Database

Problem Display
PID: 266814 (5B2/p3q3/2RQ4/1pr4r/1k5b/1NNp4/3P4/R1KB4 w - - 0 1)

Castellari, Umberto

L'Italia Scacchistica, 1950

5B2/p3q3/2RQ4/1pr4r/1k5b/1NNp4/3P4/R1KB4

#2

9 + 8

15601 Albrecht-Leiss-Degener Collection 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Kc4
      • 2.Qd4#
    • 1...Qg5
      • 2.Qd4#
    • 1...Qe1
      • 2.Qd4#
    • 1...Qe2
      • 2.Qd4#
    • 1...Qb7
      • 2.Qf4#
      • 2.Qd4#
    • 1...Qc7
      • 2.Qd4#
    • 1...Qh7
      • 2.Qd4#
    • 1...Qe8
      • 2.Qd4#
  • Tries
    • 1.Rb6?
      • threat
        • 2.Ra4#
      • 1...Kc4
        • 2.Qd4#
      • 1...axb6!
    • 1.Qf4+?
      • 1...Qe4
        • 2.Qxe4#
      • 1...Rc4!
  • Keys
    • 1.Qb8!
      • threat
        • 2.Ra4#
      • 1...Rxc3+
        • 2.dxc3#
      • 1...Kc4
        • 2.Qxb5#
      • 1...Qb7
        • 2.Qf4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 6
  • Sets
    • K(b);N_PINS(F),P-FLIGHT::QAR1(H)
    • Q(h);P_PINP(D)::QAR2(H)
    • Q(h);P_PINB(C)::QAR2(H)
    • Q(h);::QAR2(H)
  • Tries
    • Try
      • R(G);P_PINP(d)
      • Threat
        • R1(A)
      • Vars
        • K(b);N_PINS(F),N_SPINP(d),N_SPINR(e),P-FLIGHT,S_CUTR(e)::QAR1(H)
      • Refutation
        • P(g);N_SPINP(d),XR(G)
    • Try
      • Q(H);CHECK,N_PINR(e)
      • Vars
        • Q(h);N_GUARD,P_SPINQ(h),P_SPINR(e)::QAR(H),XQ(h)
      • Refutation
        • R(e);P_SPINQ(h),P_SPINR(e)
  • Actual
    • Q(H);N_PINR(e),P_PINP(d)
    • Threat
      • R1(A)
    • Vars
      • R(e);CHECK,OGATE,P_SPINQ(h),XS(F)::P(D),XR(e)
      • K(b);N_PINS(F),N_SPINP(d),P-FLIGHT,P_SPINR(e)::QAB1(H),XP(d)
      • Q(h);N_GUARD,N_SPINP(d),P_SPINR(e)::QAR(H)
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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).