MESON Chess Problem Database

Problem Display
PID: 137649 (4R3/nP5q/P3P2p/1p1k4/1P2R2P/7B/5NQB/1K6 w - - 0 1)

Ellerman, Arnoldo

Het Schaakleven, 1932

4R3/nP5q/P3P2p/1p1k4/1P2R2P/7B/5NQB/1K6

#2

12 + 5

SOLUTION

  • SOUND
  • Sets
    • 1...Qxe4+
      • 2.Qxe4#
    • 1...Qg8
      • 2.Rg4#
    • 1...Qxb7
      • 2.Rg4#
    • 1...Qc7
      • 2.Rg4#
    • 1...Qd7
      • 2.Rg4#
    • 1...Qg7
      • 2.Rg4#
    • 1...Qh8
      • 2.Rg4#
  • Keys
    • 1.b8Q!
      • threat
        • 2.Qd6#
      • 1...Qxe4+
        • 2.Qxe4#
      • 1...Kc6
        • 2.Qd6#
      • 1...Qc7
        • 2.Rg4#
      • 1...Qd7
        • 2.Rf4#
        • 2.Rg4#
      • 1...Qe7
        • 2.Rf4#
      • 1...Sc8
        • 2.Qxb5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 5
  • Sets
    • Q(e);CHECK,OGATE,P_SPINQ(e),XR(G)::QAB1(C),XQ(e)
    • Q(e);N_PINR(G)::QAB(C)+R(G)
    • Q(e);N_PINR(G),XP(K)::QAB(C)+R(G)
  • Actual
    • P(K);
    • Threat
      • QAR1(K)
    • Vars
      • Q(e);CHECK,OGATE,P_SPINQ(e),XR(G)::QAB1(C),XQ(e)
      • K(b);S_FLIGHT::QAR1(K)
      • Q(e);N_PINR(G)::QAB(C)+R(G)
      • S(d);N_GUARD::QAR2(K),XP(a)
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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).