MESON Chess Problem Database

Problem Display
PID: 88370 (2B2B2/1K6/QN4k1/R3P1N1/5PP1/5p2/r2p4/rq1b4 w - - 0 1)

Easter, Norris

The Problemist, 1931

2B2B2/1K6/QN4k1/R3P1N1/5PP1/5p2/r2p4/rq1b4

#2

10 + 7

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qc2
      • 2.Sc4#
    • 1...Qd3
      • 2.Qxd3#
    • 1...Qe4+
      • 2.Sd5#
    • 1...Qf5
      • 2.Bxf5#
    • 1...Qc1
      • 2.Sc4#
      • 2.Bf5#
      • 2.Qd3#
    • 1...Qb2
      • 2.Bf5#
      • 2.Qd3#
    • 1...Qb3
      • 2.Bf5#
    • 1...Qb4
      • 2.Bf5#
    • 1...Qb5
      • 2.Bf5#
    • 1...Qxb6+
      • 2.Qxb6#
    • 1...Rc2
      • 2.Bf5#
      • 2.Qd3#
    • 1...Bb3
      • 2.Sc4#
      • 2.Sd5#
  • Tries
    • 1.Bd7?
      • threat
        • 2.Be8#
      • 1...Qe4+
        • 2.Sd5#
      • 1...Qxb6+
        • 2.Qxb6#
      • 1...Qf5
        • 2.Bxf5#
      • 1...Qb3
        • 2.Bf5#
      • 1...Qb5
        • 2.Bf5#
      • 1...Bb3
        • 2.Sc4#
        • 2.Sd5#
      • 1...Ba4!
  • Keys
    • 1.Rd5!
      • threat
        • 2.Rd6#
      • 1...Qxb6+
        • 2.Qxb6#
      • 1...Qd3
        • 2.Qxd3#
      • 1...Qe4
        • 2.Sa4#
      • 1...Qf5
        • 2.Bxf5#
      • 1...Qb3
        • 2.Bf5#
      • 1...Qb4
        • 2.Bf5#
      • 1...Bb3
        • 2.Sa4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 1
    • REMOVED MATES = 2
  • Sets
    • Q(b);N_PINS(G)::QAR(F)+S(G)
    • Q(b);N_GUARD,N_PINS(G)::QAB(F),XQ(b)
    • Q(b);CHECK,N_PINS(G)::QAR(F)+S(G)
    • Q(b);N_GUARD,N_PINS(G)::B(I),XQ(b)
    • Q(b);N_GUARD::B(I)
    • Q(b);CHECK,OGATE,P_SPINQ(b),XS(G)::QAR(F),XQ(b)
  • Tries
    • Try
      • B(I);
      • Threat
        • B(I)
      • Vars
        • Q(b);CHECK,N_PINS(G)::QAR(F)+S(G)
        • Q(b);CHECK,OGATE,P_SPINQ(b),XS(G)::QAR(F),XQ(b)
        • Q(b);N_GUARD,N_PINS(G)::B(I),XQ(b)
        • Q(b);N_GUARD::B(I)
      • Refutation
        • B(c);
  • Actual
    • R(C);
    • Threat
      • R(C)
    • Vars
      • Q(b);CHECK,OGATE,P_SPINQ(b),XS(G)::QAR(F),XQ(b)
      • Q(b);N_GUARD,N_PINS(G)::QAB(F),XQ(b)
      • Q(b);N_PINS(G),P_PINR(C)::QAR(F)+S(G)
      • Q(b);N_GUARD,N_PINS(G)::B(I),XQ(b)
      • Q(b);N_GUARD::B(I)
      • B(c);N_PINS(G)::QAR(F)+S(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).