MESON Chess Problem Database

Problem Display
PID: 51492 (3nQ2B/4b2r/3p2p1/3k1PRp/4N3/2P5/1n1N3K/5b2 w - - 0 1)

Morra, Juan Carlos

The Guardian, 1962

3nQ2B/4b2r/3p2p1/3k1PRp/4N3/2P5/1n1N3K/5b2

#2

8 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Bg2
      • 2.Qb5#
    • 1...Bh3
      • 2.Qb5#
    • 1...Bb5
      • 2.Qxb5#
    • 1...Bf8
      • 2.fxg6#
      • 2.f6#
    • 1...Sd3
      • 2.c4#
    • 1...Sc4
      • 2.Qb5#
    • 1...Se6
      • 2.Qa8#
    • 1...Sf7
      • 2.Qa8#
  • Tries
    • 1.c4+?
      • 1...Sxc4
        • 2.Qb5#
      • 1...Bxc4!
  • Keys
    • 1.Qd7!
      • threat
        • 2.f6#
      • 1...Bxg5
        • 2.Qxd6#
      • 1...gxf5
        • 2.Rxf5#
      • 1...Bf6
        • 2.Qxd6#
      • 1...Bh3
        • 2.Qb5#
      • 1...Sd3
        • 2.c4#
      • 1...Sc4
        • 2.Qb5#
      • 1...Sc6
        • 2.Qe6#
      • 1...Se6
        • 2.Qb7#
      • 1...Sf7
        • 2.Qb7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 4
    • REMOVED MATES = 2
  • Sets
    • B(a);N_GUARD::QAR2(G)
    • B(a);N_GUARD::QAR2(G),XB(a)
    • S(b);N_GUARD,S_CUTB(a)::P(C)
    • S(b);S_CUTB(a)::QAR2(G)
    • S(i);OGATE::QAB(G)
  • Tries
    • Try
      • P(C);CHECK
      • Vars
        • S(b);XP(C)::QAR2(G)
      • Refutation
        • B(a);XP(C)
  • Actual
    • Q(G);P_PINP(e)
    • Threat
      • R(F)+P(E)
    • Vars
      • B(g);N_GUARD,XR(F)::QAR1(G),XP(e)
      • P(f);N_SPINP(e),OGATE,P_SPINP(f),XP(E)::R(F),XP(f)
      • B(g);N_GUARD::QAR1(G),XP(e)
      • B(a);N_GUARD::QAR2(G)
      • S(b);N_GUARD,S_CUTB(a)::P(C)
      • S(b);S_CUTB(a)::QAR2(G)
      • S(i);N_GUARD,SBLOCK::QAB1(G)
      • S(i);N_GUARD::QAB(G)
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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).