MESON Chess Problem Database

Problem Display
PID: 194906 (5r2/p1pP2p1/Rb2nkNN/p5pp/2pR4/8/Q4K2/BB6 w - - 0 1)

Guidelli, Giorgio

1/2 Prize, L'Italia Scacchistica, 1918

5r2/p1pP2p1/Rb2nkNN/p5pp/2pR4/8/Q4K2/BB6

#2

9 + 11

6490 yacpdb 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Rf7
      • 2.Sg8#
    • 1...Re8
      • 2.dxe8S#
    • 1...Bxd4+
      • 2.Bxd4#
    • 1...Sc5
      • 2.Rd6#
    • 1...c5
      • 2.Rf4#
  • Tries
    • 1.Rxb6?
      • threat
        • 2.Rxc4#
        • 2.Rf4#
      • 1...axb6
        • 2.Rf4#
      • 1...cxb6
        • 2.Rf4#
      • 1...gxh6
        • 2.Rf4#
      • 1...c3
        • 2.Rxe6#
        • 2.Qxe6#
      • 1...c6
        • 2.Rf4#
      • 1...g4!
    • 1.Qc2?
      • threat
        • 2.Qf5#
      • 1...Bxd4+
        • 2.Bxd4#
      • 1...gxh6!
    • 1.Qe2?
      • threat
        • 2.Qe5#
      • 1...Bxd4+
        • 2.Bxd4#
      • 1...gxh6!
  • Keys
    • 1.Qa3!
      • threat
        • 2.Qe7#
      • 1...Bxd4+
        • 2.Bxd4#
      • 1...Sc5
        • 2.Rd6#
      • 1...Rf7
        • 2.Sg8#
      • 1...Re8
        • 2.dxe8S#
      • 1...Bc5
        • 2.Qf3#
      • 1...c5
        • 2.Rf4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • R(k);N_GUARD,SBLOCK::S(H)
    • R(k);OGATE::PXR(k)=S
    • B(e);CHECK,OGATE,P_SPINB(e),P_SPINS(f),XR(E)::B(A),XB(e)
    • S(f);N_PINR(E),P_SPINB(e)::B(A)+R(E),DCHECK
    • P(i);N_PINR(E)::B(A)+R(E),DCHECK
  • Tries
    • Try
      • R(F);N_SPINR(E),P_PINS(f),XB(e)
      • Threat
        • DUALS(2)
      • Vars
        • P(h);N_SPINS(f),XR(F)::B(A)+R(E),DCHECK
        • P(i);N_SPINS(f),XR(F)::B(A)+R(E),DCHECK
        • P(j);XS(H)::B(A)+R(E),DCHECK
        • P(i);N_SPINS(f)::B(A)+R(E),DCHECK
      • Refutation
        • P(c);
    • Try
      • Q(C);
      • Threat
        • QAR1(C)
      • Vars
        • B(e);CHECK,OGATE,P_SPINB(e),P_SPINS(f),XR(E)::B(A),XB(e)
      • Refutation
        • P(j);XS(H)
    • Try
      • Q(C);
      • Threat
        • QAB1(C)
      • Vars
        • B(e);CHECK,OGATE,P_SPINB(e),P_SPINS(f),XR(E)::B(A),XB(e)
      • Refutation
        • P(j);XS(H)
  • Actual
    • Q(C);
    • Threat
      • QAB1(C)
    • Vars
      • B(e);CHECK,OGATE,P_SPINB(e),P_SPINS(f),XR(E)::B(A),XB(e)
      • S(f);N_PINR(E),P_SPINB(e)::B(A)+R(E),DCHECK
      • R(k);N_GUARD,SBLOCK::S(H)
      • R(k);OGATE::PXR(k)=S
      • B(e);P_SPINS(f)::QAR(C)
      • P(i);N_PINR(E)::B(A)+R(E),DCHECK
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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).