MESON Chess Problem Database

Problem Display
PID: 138607 (b1N2K1B/1nR2B2/1P2p3/1ppk1p1N/q6Q/1P1n1P2/8/8 w - - 0 1)

Ellerman, Arnoldo

2nd HM., Midweek Sports Referee, 1926

b1N2K1B/1nR2B2/1P2p3/1ppk1p1N/q6Q/1P1n1P2/8/8

#2

10 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Sb4
      • 2.Sf4#
    • 1...Se5
      • 2.Sf6#
    • 1...Sa5
      • 2.Qd8#
    • 1...Sd6
      • 2.Se7#
    • 1...Sd8
      • 2.Qxd8#
    • 1...b4
      • 2.Qc4#
    • 1...c4
      • 2.Qd4#
  • Tries
    • 1.Rd7+?
      • 1...Sd6
        • 2.Se7#
        • 2.Rxd6#
      • 1...Kc6!
    • 1.Qf6?
      • threat
        • 2.Bxe6#
        • 2.Qxe6#
      • 1...Se5
        • 2.Qxe5#
      • 1...Sf4
        • 2.Qe5#
        • 2.Qxf5#
      • 1...Sd8
        • 2.Qxd8#
      • 1...Qe4!
    • 1.Qd8+?
      • 1...Sd6
        • 2.Se7#
        • 2.Qxd6#
      • 1...Sxd8!
  • Keys
    • 1.Be8!
      • threat
        • 2.Bc6#
      • 1...e5
        • 2.Bf7#
      • 1...Sb4
        • 2.Sf4#
      • 1...Se5
        • 2.Sf6#
      • 1...Sa5
        • 2.Qd8#
      • 1...Sd6
        • 2.Se7#
      • 1...Sd8
        • 2.Qxd8#
      • 1...b4
        • 2.Qc4#
      • 1...c4
        • 2.Qd4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • S(a);N_GUARD,S_CUTQ(b)::S(D)
    • S(a);SBLOCK::S(D)
    • S(h);N_GUARD::QAR(C)
    • S(h);SBLOCK::S(H)
    • S(h);N_GUARD::QAR(C),XS(h)
    • P(c);N_GUARD,S_CUTQ(b)::QAB1(C)
    • P(d);N_GUARD,S_CUTQ(b)::QAR1(C)
  • Tries
    • Try
      • R(F);CHECK
      • Refutation
        • K(e);N_SPINP(g),S_FLIGHT
    • Try
      • Q(C);
      • Threat
        • DUALS(2)
      • Vars
        • S(a);N_GUARD::QAR1(C),XS(a)
        • S(h);N_GUARD::QAR(C),XS(h)
      • Refutation
        • Q(b);
    • Try
      • Q(C);CHECK
      • Refutation
        • S(h);XQ(C)
  • Actual
    • B(G);N_PINP(g)
    • Threat
      • B(G)
    • Vars
      • P(g);OGATEB::B(G)
      • S(a);N_GUARD,S_CUTQ(b)::S(D)
      • S(a);SBLOCK::S(D)
      • S(h);N_GUARD::QAR(C)
      • S(h);SBLOCK::S(H)
      • S(h);N_GUARD::QAR(C),XS(h)
      • P(c);N_GUARD,S_CUTQ(b)::QAB1(C)
      • P(d);N_GUARD,S_CUTQ(b)::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).