MESON Chess Problem Database

Problem Display
PID: 267413 (1nRb1B2/qR4r1/4p3/pNN4r/Pk4PQ/1P1P4/3P4/1K2n3 w - - 0 1)

Cristoffanini, Guido

El Diluvio, 1933

1nRb1B2/qR4r1/4p3/pNN4r/Pk4PQ/1P1P4/3P4/1K2n3

#2

12 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Rxg4
      • 2.Qxg4#
    • 1...Re7
      • 2.gxh5#
  • Tries
    • 1.Kb2?
      • threat
        • 2.Sa6#
      • 1...Sxd3+
        • 2.Sxd3#
      • 1...Qxc5
        • 2.Sc7#
      • 1...Rxc5
        • 2.g5#
      • 1...Qa6
        • 2.Sxa6#
      • 1...Re7
        • 2.gxh5#
      • 1...Be7
        • 2.Sxa7#
      • 1...Sa6
        • 2.Sxa6#
      • 1...Bf6+!
    • 1.Sd4+?
      • 1...Qb6
        • 2.Sa6#
      • 1...Qxb7
        • 2.Sa6#
      • 1...Rxb7
        • 2.Sa6#
      • 1...Bb6
        • 2.Sa6#
      • 1...Ka3!
    • 1.gxh5+?
      • 1...Rg4
        • 2.Qxg4#
      • 1...Bxh4!
  • Keys
    • 1.Ka2!
      • threat
        • 2.Sa6#
      • 1...Qxc5
        • 2.Sc7#
      • 1...Rxc5
        • 2.g5#
      • 1...Qa6
        • 2.Sxa6#
      • 1...Re7
        • 2.gxh5#
      • 1...Be7
        • 2.Sxa7#
      • 1...Sa6
        • 2.Sxa6#

This is a version

Version by Esteban Puig y Puig.

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 1
  • Sets
    • R(g);OGATE,P_SPINR(g),XP(F)::QAR(G),XR(g)
    • R(g);N_GUARD,S_CUTB(i)::QAR(G)+P(F),XR(d)
  • Tries
    • Try
      • K(A);P-FLIGHT
      • Threat
        • B(L)+S(I),DCHECK
      • Vars
        • S(a);CHECK,XP(D)::B(L)+S(I),DCHECK,XS(a)
        • Q(f);N_GUARD,P_SPINQ(f),XS(I)::R(J)+S(H)
        • R(d);N_GUARD,P_SPINR(d),XS(I)::QAR(G)+P(F)
        • Q(f);::B(L)+S(I),DCHECK,XQ(f)
        • R(g);N_GUARD,S_CUTB(i)::QAR(G)+P(F),XR(d)
        • B(i);N_GUARD,S_CUTR(g)::R(J)+S(H),XQ(f)
        • S(h);::B(L)+S(I),DCHECK,XS(h)
      • Refutation
        • B(i);CHECK
    • Try
      • S(H);CHECK
      • Vars
        • Q(f);P_SPINQ(f)::B(L)+S(I),DCHECK
        • Q(f);XR(J)::B(L)+S(I),DCHECK
        • R(g);XR(J)::B(L)+S(I),DCHECK
        • B(i);P_SPINB(i)::B(L)+S(I),DCHECK
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • P(F);CHECK,XR(d)
      • Vars
        • R(g);N_GUARD,P_SPINR(g)::QAR(G),XR(g)
      • Refutation
        • B(i);XQ(G)
  • Actual
    • K(A);S_FLIGHT
    • Threat
      • B(L)+S(I),DCHECK
    • Vars
      • Q(f);N_GUARD,P_SPINQ(f),XS(I)::R(J)+S(H)
      • R(d);N_GUARD,P_SPINR(d),XS(I)::QAR(G)+P(F)
      • Q(f);::B(L)+S(I),DCHECK,XQ(f)
      • R(g);N_GUARD,S_CUTB(i)::QAR(G)+P(F),XR(d)
      • B(i);N_GUARD,S_CUTR(g)::R(J)+S(H),XQ(f)
      • S(h);::B(L)+S(I),DCHECK,XS(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).