MESON Chess Problem Database

Problem Display
PID: 21151 (8/5BRp/5B2/2N1qPn1/1P1k4/2p1Np1p/2p2Q2/r2bK1nr w - - 0 1)

Guidelli, Giorgio

Good Companions (July), 1917

8/5BRp/5B2/2N1qPn1/1P1k4/2p1Np1p/2p2Q2/r2bK1nr

#2

9 + 12

3132 The Good Companion Two-Mover 1922
3147 Chess Problems: Introduction to an Art 1963

SOLUTION

  • SOUND
  • Sets
    • 1...Qxf6
      • 2.Sc4#
      • 2.Sg4#
    • 1...Be2+
      • 2.Sd1#
    • 1...Se2+
      • 2.Sf1#
    • 1...Se4
      • 2.Sxc2#
    • 1...Sxf7
      • 2.Rg4#
  • Tries
    • 1.Rxg5?
      • threat
        • 2.Rg4#
      • 1...Be2+
        • 2.Sd1#
      • 1...Se2+
        • 2.Sf1#
      • 1...Qxf6
        • 2.Sc4#
        • 2.Sg4#
      • 1...h5!
    • 1.Qh4+?
      • 1...Se4
        • 2.Qxe4#
      • 1...Kxe3!
  • Keys
    • 1.Ba2!
      • threat
        • 2.Rd7#
      • 1...Be2+
        • 2.Sd1#
      • 1...Se2+
        • 2.Sf1#
      • 1...Qxf6
        • 2.Sg4#
      • 1...Se4
        • 2.Sxc2#
      • 1...Sf7
        • 2.Rg4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • B(b);CHECK,N_PINS(C)::QAB(B)+S(C)
    • S(c);CHECK,N_PINS(C)::QAB(B)+S(C)
    • S(k);N_PINS(C)::QAB(B)+S(C),DCHECK,XP(e)
    • S(k);OGATE,XB(H)::R(I)
  • Tries
    • Try
      • R(I);XS(k)
      • Threat
        • R(I)
      • Vars
        • B(b);CHECK,N_PINS(C)::QAB(B)+S(C)
        • S(c);CHECK,N_PINS(C)::QAB(B)+S(C)
      • Refutation
        • P(l);
    • Try
      • Q(B);CHECK
      • Vars
        • S(k);N_GUARD,N_PINS(C),P_SPINS(k)::QAR1(B),XS(k)
      • Refutation
        • K(i);N_SPINQ(j),S_FLIGHT,XS(C)
  • Actual
    • B(H);
    • Threat
      • R(I)
    • Vars
      • B(b);CHECK,N_PINS(C)::QAB(B)+S(C)
      • S(c);CHECK,N_PINS(C)::QAB(B)+S(C)
      • Q(j);N_PINS(C),N_SPINQ(j),XB(G)::QAB(B)+S(C)
      • S(k);N_PINS(C)::QAB(B)+S(C),DCHECK,XP(e)
      • S(k);OGATE::R(I)
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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).