MESON Chess Problem Database

Problem Display
PID: 64453 (3N4/r1p5/3N2p1/3kP1Pp/1Pr2nQK/1B4Pp/b2n2p1/B1bRRq2 w - - 0 1)

Ellerman, Arnoldo

Chess, 1947

3N4/r1p5/3N2p1/3kP1Pp/1Pr2nQK/1B4Pp/b2n2p1/B1bRRq2

#2

12 + 13

SOLUTION

  • SOUND
  • Sets
    • 1...Qg1
      • 2.Qf3#
    • 1...Qh1
      • 2.Qf3#
    • 1...Qf3
      • 2.Qxf3#
    • 1...Se2
      • 2.Qxc4#
      • 2.Qe4#
    • 1...Sd3
      • 2.Qd4#
    • 1...Se6
      • 2.Qe4#
  • Tries
    • 1.Rxd2+?
      • 1...Qd3
        • 2.Qf3#
      • 1...Sd3
        • 2.Qxc4#
        • 2.Qd4#
        • 2.Qe4#
      • 1...Bxd2!
  • Keys
    • 1.Se8!
      • threat
        • 2.Sf6#
        • 2.Qd7#
      • 1...Qxe1
        • 2.Sf6#
      • 1...hxg4
        • 2.Sf6#
      • 1...Qe2
        • 2.Sf6#
      • 1...Bb2
        • 2.Qd7#
      • 1...Ra6
        • 2.Sxc7#
      • 1...Se2
        • 2.Qxc4#
      • 1...Sd3
        • 2.Qd4#
      • 1...Se6
        • 2.Qe4#
      • 1...c5
        • 2.Sf6#
      • 1...c6
        • 2.Sf6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 8
    • REMOVED MATES = 3
  • Sets
    • Q(b);N_GUARD::QAB(G)
    • Q(b);N_GUARD::QAB(G),XQ(b)
    • S(h);N_SPINS(d),OGATE,P_PINQ(G)::QAR1(G)
    • S(h);OGATE,P_PINQ(G)::QAB1(G)
  • Tries
    • Try
      • R(B);CHECK,XS(d)
      • Vars
        • Q(b);P_SPINQ(b)::QAB(G)
      • Refutation
        • B(a);XR(B)
  • Actual
    • S(K);
    • Threat
      • DUALS(2)
    • Vars
      • Q(b);P_PINP(E),XR(C)::S(K)
      • P(j);XQ(G)::S(K)
      • Q(b);::S(K)
      • B(a);::QAR2(G)
      • R(l);N_GUARD::S(K),XP(m)
      • S(h);OGATE,P_PINQ(G)::QAB1(G),XR(g)
      • S(h);N_SPINS(d),OGATE,P_PINQ(G)::QAR1(G)
      • S(h);OGATE,P_PINQ(G)::QAB1(G)
      • P(m);::S(K)
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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).