MESON Chess Problem Database

Problem Display
PID: 40830 (2rRR3/7b/q7/BBn5/5Np1/1Q6/2PP1pN1/1K1k1n2 w - - 0 1)

Ellerman, Arnoldo

6/7 Prize, La Settimana Enigmistica, 1932

2rRR3/7b/q7/BBn5/5Np1/1Q6/2PP1pN1/1K1k1n2

#2

10 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Qb7
      • 2.Be2#
    • 1...Qxa5
      • 2.Be2#
    • 1...Qb6
      • 2.Be2#
    • 1...Qc6
      • 2.Be2#
    • 1...Qd6
      • 2.Be2#
    • 1...Qf6
      • 2.Be2#
    • 1...Qg6
      • 2.Be2#
    • 1...Qh6
      • 2.Be2#
    • 1...Qa7
      • 2.Be2#
    • 1...Qa8
      • 2.Be2#
    • 1...Bxc2+
      • 2.Qxc2#
    • 1...Sxd2+
      • 2.Rxd2#
    • 1...Sd3
      • 2.c4#
    • 1...Se4
      • 2.c3#
      • 2.c4#
    • 1...g3
      • 2.Qf3#
  • Tries
    • 1.Se3+?
      • 1...Ke1
        • 2.Sfg2#
      • 1...Sxe3!
  • Keys
    • 1.Sh3!
      • threat
        • 2.Sxf2#
      • 1...Bxc2+
        • 2.Qxc2#
      • 1...Sxd2+
        • 2.Rxd2#
      • 1...gxh3
        • 2.Qf3#
      • 1...Qf6
        • 2.Be2#
      • 1...Sd3
        • 2.c4#
      • 1...Se4
        • 2.c3#
      • 1...g3
        • 2.Qf3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 9
  • Sets
    • Q(f);N_GUARD::B(H)
    • Q(f);N_GUARD,XB(G)::B(H)
    • B(g);CHECK,OGATE,P_SPINB(g),XP(B)::QAB1(E),XB(g)
    • S(b);CHECK,OGATE,P_SPINS(b),XP(C)::R1(I),XS(b)
    • S(e);N_PINP(B)::QAB(E)+P(B)
    • P(d);N_GUARD::QAB(E)
  • Tries
    • Try
      • S(D);CHECK
      • Vars
        • K(a);P-FLIGHT::S(F)
      • Refutation
        • S(b);XS(D)
  • Actual
    • S(F);
    • Threat
      • S(F),XP(c)
    • Vars
      • B(g);CHECK,OGATE,P_SPINB(g),XP(B)::QAB1(E),XB(g)
      • S(b);CHECK,OGATE,P_SPINS(b),XP(C)::R1(I),XS(b)
      • P(d);N_GUARD,XS(F)::QAB(E)
      • Q(f);N_GUARD::B(H)
      • S(e);N_PINP(B)::QAB(E)+P(B)
      • P(d);N_GUARD::QAB(E)
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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).