MESON Chess Problem Database

Problem Display
PID: 138499 (nq2n3/4Rb1B/2r2r2/2pp4/1p1k1p1B/N2N1p2/1P3P2/2Q3bK w - - 0 1)

Ellerman, Arnoldo

2/3 Prize, Eskilstuna Kuriren, 1920

nq2n3/4Rb1B/2r2r2/2pp4/1p1k1p1B/N2N1p2/1P3P2/2Q3bK

#2

9 + 13

SOLUTION

  • SOUND
  • Sets
    • 1...Qe5
      • 2.Sb5#
    • 1...Qd6
      • 2.Sb5#
    • 1...Qa7
      • 2.Sb5#
    • 1...Qc7
      • 2.Sb5#
    • 1...Qb5
      • 2.Sxb5#
    • 1...Qc8
      • 2.Sb5#
    • 1...Qd8
      • 2.Sb5#
    • 1...Ra6
      • 2.Qxc5#
    • 1...Rb6
      • 2.Qxc5#
    • 1...Rcd6
      • 2.Qxc5#
    • 1...Rce6
      • 2.Qxc5#
    • 1...Rfd6
      • 2.Qxf4#
    • 1...Bxf2
      • 2.Bxf2#
    • 1...Sb6
      • 2.Sb5#
    • 1...Sd6
      • 2.Bxf6#
    • 1...bxa3
      • 2.Qc3#
    • 1...b3
      • 2.Qc3#
    • 1...c4
      • 2.Sc2#
  • Tries
    • 1.Bxf6+?
      • 1...Qe5
        • 2.Sb5#
        • 2.Bxe5#
        • 2.Qxf4#
      • 1...Rxf6
        • 2.Qxc5#
      • 1...Sxf6!
    • 1.Re4+?
      • 1...Kxd3
        • 2.Qd1#
        • 2.Qc2#
      • 1...dxe4!
  • Keys
    • 1.Rd7!
      • threat
        • 2.Qc4#
      • 1...Bxf2
        • 2.Bxf2#
      • 1...bxa3
        • 2.Qc3#
      • 1...Qd6
        • 2.Sb5#
      • 1...Qb5
        • 2.Sxb5#
      • 1...Rcd6
        • 2.Qxc5#
      • 1...Rfd6
        • 2.Qxf4#
      • 1...Sb6
        • 2.Sb5#
      • 1...Sd6
        • 2.Bxf6#
      • 1...c4
        • 2.Sc2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 0
    • REMOVED MATES = 9
  • Sets
    • Q(l);N_GUARD::S(E)
    • Q(l);N_GUARD::S(E),XQ(l)
    • R(h);N_GUARD::QAB1(A),XP(f)
    • R(i);N_GUARD,S_CUTQ(l)::QAR2(A),XP(e)
    • B(a);OGATE,XP(D)::B(G),XB(a)
    • S(k);S_CUTQ(l)::S(E)
    • S(m);N_GUARD,S_CUTQ(l),S_CUTR(h)::B(G),XR(i)
    • P(c);N_GUARD,XS(E)::QAB1(A)
    • P(c);N_GUARD::QAB1(A)
    • P(f);SBLOCK::S(E)
  • Tries
    • Try
      • B(G);CHECK,XR(i)
      • Vars
        • R(h);XB(G)::QAB1(A),XP(f)
      • Refutation
        • S(m);XB(G)
    • Try
      • R(H);CHECK
      • Refutation
        • P(g);XR(H)
  • Actual
    • R(H);P_PINP(g)
    • Threat
      • QAR1(A)
    • Vars
      • B(a);OGATE,XP(D)::B(G),XB(a)
      • P(c);N_GUARD,XS(E)::QAB1(A)
      • Q(l);N_GUARD,N_SPINP(g)::S(E)
      • Q(l);N_GUARD::S(E),XQ(l)
      • R(h);N_GUARD,N_SPINP(g)::QAB1(A),XP(f)
      • R(i);N_GUARD,N_SPINP(g),S_CUTQ(l)::QAR2(A),XP(e)
      • S(k);S_CUTQ(l)::S(E)
      • S(m);N_GUARD,N_SPINP(g),S_CUTQ(l),S_CUTR(h)::B(G),XR(i)
      • P(f);SBLOCK::S(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).