MESON Chess Problem Database

Problem Display
PID: 170072 (4R3/8/b1p5/2pp1P2/p1pk1P2/2p1N3/2Q4p/2NK2n1 w - - 0 1)

Rice, John Michael

StrateGems, 2017

4R3/8/b1p5/2pp1P2/p1pk1P2/2p1N3/2Q4p/2NK2n1

#2

7 + 10

SOLUTION

  • SOUND
  • Sets
    • 1...Se2
      • 2.Sxe2#
    • 1...Sf3
      • 2.Se2#
    • 1...Sh3
      • 2.Se2#
  • Tries
    • 1.Sf1?
      • threat
        • 2.Qf2#
      • 1...Se2
        • 2.Sxe2#
      • 1...Sh3
        • 2.Se2#
      • 1...h1S!
    • 1.Sg2?
      • threat
        • 2.Qf2#
      • 1...Se2
        • 2.Sxe2#
      • 1...Sh3
        • 2.Se2#
      • 1...h1S!
    • 1.Sg4?
      • threat
        • 2.Qf2#
      • 1...Se2
        • 2.Sxe2#
      • 1...Sh3
        • 2.Se2#
      • 1...h1S!
    • 1.Qf2?
      • threat
        • 2.Sf1#
        • 2.Sc2#
        • 2.Sg2#
        • 2.Sg4#
      • 1...h1S
        • 2.Sc2#
      • 1...Sh3
        • 2.Sc2#
      • 1...c2+!
    • 1.Qg2?
      • threat
        • 2.Sc2#
        • 2.Qg7#
      • 1...Sf3
        • 2.Sc2#
      • 1...c2+!
    • 1.Qxh2?
      • threat
        • 2.Sc2#
        • 2.Qh8#
      • 1...Sf3
        • 2.Sc2#
      • 1...Sh3
        • 2.Sc2#
      • 1...c2+!
  • Keys
    • 1.Sxc4!
      • threat
        • 2.Qd3#
      • 1...Kxc4
        • 2.Qxa4#
      • 1...Bxc4
        • 2.Qf2#
      • 1...dxc4
        • 2.Qe4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 3
  • Sets
    • S(a);N_GUARD::S(A),XS(a)
    • S(a);N_GUARD::S(A)
  • Tries
    • Try
      • S(D);
      • Threat
        • QAB(C)
      • Vars
        • S(a);N_GUARD::S(A),XS(a)
        • S(a);N_GUARD::S(A)
      • Refutation
        • P(b);
    • Try
      • S(D);
      • Threat
        • QAB(C)
      • Vars
        • S(a);N_GUARD::S(A),XS(a)
        • S(a);N_GUARD::S(A)
      • Refutation
        • P(b);
    • Try
      • S(D);
      • Threat
        • QAB(C)
      • Vars
        • S(a);N_GUARD::S(A),XS(a)
        • S(a);N_GUARD::S(A)
      • Refutation
        • P(b);
    • Try
      • Q(C);
      • Threat
        • DUALS(4)
      • Vars
        • P(b);::QAB(C)+S(D),DCHECK
        • S(a);::QAB(C)+S(D),DCHECK
      • Refutation
        • P(c);CHECK
    • Try
      • Q(C);
      • Threat
        • DUALS(2)
      • Vars
        • S(a);::S(D)
      • Refutation
        • P(c);CHECK
    • Try
      • Q(C);XP(b)
      • Threat
        • DUALS(2)
      • Vars
        • S(a);::S(D)
      • Refutation
        • P(c);CHECK
  • Actual
    • S(D);XP(e)
    • Threat
      • QAR1(C)
    • Vars
      • K(f);OGATEB,P-FLIGHT,P_SPINP(c),XS(D)::QAR2(C),XP(d)
      • B(i);SBLOCK,XS(D)::QAB(C)
      • P(h);N_GUARD,SBLOCK,XS(D)::QAR1(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).