MESON Chess Problem Database

Problem Display
PID: 147937 (b2R4/5Q2/3Pp3/1B1k2p1/1p1Pp1p1/r3p3/rnN1KnNq/4b3 w - - 0 1)

Easter, Norris

Magasinet, 1933-1934

b2R4/5Q2/3Pp3/1B1k2p1/1p1Pp1p1/r3p3/rnN1KnNq/4b3

#2

8 + 14

14868 Pirnie Collection 2013

SOLUTION

  • SOUND
  • Sets
    • 1...Ra4
      • 2.Sgxe3#
    • 1...Ra5
      • 2.Sgxe3#
    • 1...Ra6
      • 2.Sgxe3#
    • 1...Ra7
      • 2.Sgxe3#
    • 1...Bc3
      • 2.Sgxe3#
    • 1...Bb7
      • 2.Qxb7#
    • 1...Sbd3
      • 2.Sxe3#
    • 1...b3
      • 2.Sgxe3#
  • Tries
    • 1.Qf5+?
      • 1...Qe5
        • 2.Qxe5#
      • 1...e5
        • 2.Qf7#
      • 1...exf5!
  • Keys
    • 1.Qa7!
      • threat
        • 2.Qc5#
      • 1...Rxa7
        • 2.Sgxe3#
      • 1...e5
        • 2.Qf7#
      • 1...Rc3
        • 2.Sxb4#
      • 1...Sbd3
        • 2.Sxe3#
      • 1...Sa4
        • 2.Qxa8#
      • 1...Sfd3
        • 2.Sxe3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 6
  • Sets
    • R(f);N_GUARD::S(C),XP(g)
    • B(a);S_CUTR(f)::S(C),XP(g)
    • B(n);N_GUARD::QAB(G),XB(n)
    • S(c);P_PINS(A),S_CUTR(f)::S(C),XP(g)
    • P(h);S_CUTR(f)::S(C),XP(g)
  • Tries
    • Try
      • Q(G);CHECK,N_PINP(m)
      • Vars
        • Q(e);N_GUARD,P_SPINQ(e)::QAR1(G),XQ(e)
        • P(m);OGATEB,P_SPINP(m)::QAB(G)
      • Refutation
        • P(m);XQ(G)
  • Actual
    • Q(G);N_PINP(m)
    • Threat
      • QAR1(G)
    • Vars
      • R(f);N_GUARD,XQ(G)::S(C),XP(g)
      • P(m);OGATEB::QAB(G)
      • R(f);S_CUTB(a)::S(A),XP(h)
      • S(c);P_PINS(A),S_CUTR(f)::S(C),XP(g)
      • S(c);P_PINS(A),S_CUTR(f)::QAB(G),XB(n)
      • S(d);P_PINS(C),S_CUTR(f)::S(A),XP(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).