MESON Chess Problem Database

Problem Display
PID: 79593 (2R5/3Rp3/p2b3K/1b4pn/N1Nk4/3p1B2/2pQ4/3n4 w - - 0 1)

Afek, Yochanan

Aloni, Yoel

Hirschenson, Aaron

2nd Prize, Israel Ring Ty., 2006

2R5/3Rp3/p2b3K/1b4pn/N1Nk4/3p1B2/2pQ4/3n4

#2

7 + 10

721 Variantim 2007
56 The Problemist 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Sb2
      • 2.Qc3#
      • 2.Qe3#
      • 2.Qf2#
    • 1...Sf2
      • 2.Qc3#
      • 2.Qe3#
      • 2.Qxf2#
    • 1...Sc3
      • 2.Qxc3#
      • 2.Qe3#
      • 2.Qf2#
    • 1...Se3
      • 2.Qc3#
      • 2.Qxe3#
    • 1...e5
      • 2.Rxd6#
    • 1...e6
      • 2.Rxd6#
  • Tries
    • 1.Qe1?
      • threat
        • 2.Qe4#
        • 2.Qe5#
      • 1...Bxa4
        • 2.Qe5#
      • 1...Bxc4
        • 2.Qe4#
      • 1...Bxd7
        • 2.Qe4#
      • 1...d2
        • 2.Qxd2#
        • 2.Qe4#
      • 1...Sf2
        • 2.Qxf2#
        • 2.Qc3#
        • 2.Qa1#
        • 2.Qe3#
        • 2.Qe5#
      • 1...Sc3
        • 2.Qf2#
        • 2.Qxc3#
        • 2.Qg1#
        • 2.Qe3#
        • 2.Qe5#
      • 1...Se3
        • 2.Qc3#
        • 2.Qa1#
        • 2.Qxe3#
      • 1...Sg3
        • 2.Qe5#
      • 1...Sf6
        • 2.Qe5#
      • 1...e5
        • 2.Rxd6#
        • 2.Qe4#
        • 2.Qxe5#
      • 1...Bc6!
    • 1.Qf2+?
      • 1...Se3
        • 2.Qxe3#
      • 1...Sxf2!
  • Keys
    • 1.Qa5!
      • threat
        • 2.Qb6#
      • 1...Bxa4
        • 2.Qe5#
      • 1...Bxc4
        • 2.Qc5#
      • 1...Bxd7
        • 2.Qd5#
      • 1...Bc6
        • 2.Qc5#
      • 1...d2
        • 2.Qxd2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 2
  • Sets
    • P(j);N_GUARD::R(F),XB(i)
  • Tries
    • Try
      • Q(A);N_PINP(c)
      • Threat
        • DUALS(2)
      • Vars
        • B(e);XS(C)::QAB1(A)
        • B(e);XS(D)::QAR1(A)
        • B(e);N_SPINB(i),XR(F)::QAR1(A)
        • S(g);::QAB1(A)
      • Refutation
        • B(e);
    • Try
      • Q(A);CHECK,N_PINP(c)
      • Vars
        • S(a);N_GUARD,P_SPINS(a)::QAB1(A),XS(a)
      • Refutation
        • S(a);XQ(A)
  • Actual
    • Q(A);N_PINP(c)
    • Threat
      • QAB(A)
    • Vars
      • B(e);OGATE,XS(C)::QAB1(A)
      • B(e);OGATE,XS(D)::QAB1(A)
      • B(e);N_SPINB(i),OGATE,XR(F)::QAR1(A)
      • B(e);OGATE::QAB1(A)
      • P(c);OGATEB::QAR2(A),XP(c)
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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).