MESON Chess Problem Database

Problem Display
PID: 140409 (Br1r4/2p1Q1p1/1k3qR1/4N3/R1P1b3/2ppKp2/n4B2/8 w - - 0 1)

Ellerman, Arnoldo

Problemas, 1945

Br1r4/2p1Q1p1/1k3qR1/4N3/R1P1b3/2ppKp2/n4B2/8

#2

8 + 11

SOLUTION

  • SOUND
  • Sets
    • 1...Rd7
      • 2.Sxd7#
    • 1...Rc8
      • 2.Sd7#
    • 1...Re8
      • 2.Sd7#
    • 1...Rf8
      • 2.Sd7#
    • 1...Rg8
      • 2.Sd7#
    • 1...Rh8
      • 2.Sd7#
    • 1...Sc1
      • 2.Qb4#
    • 1...Sb4
      • 2.Qxb4#
    • 1...c5
      • 2.Qa7#
    • 1...c6
      • 2.Qa7#
  • Tries
    • 1.Kxe4+?
      • 1...c5
        • 2.Bxc5#
        • 2.Qxc5#
        • 2.Qa7#
      • 1...Rd4+!
    • 1.Rxf6+?
      • 1...Rd6
        • 2.Sd7#
      • 1...Bc6
        • 2.Rxc6#
      • 1...c6
        • 2.Qa7#
      • 1...gxf6!
  • Keys
    • 1.Qd7!
      • threat
        • 2.Qb5#
      • 1...Kc5
        • 2.Kxe4#
      • 1...Rxd7
        • 2.Sxd7#
      • 1...Qc6
        • 2.Kf4#
      • 1...Bc6
        • 2.Kxd3#
      • 1...c5
        • 2.Qa7#
      • 1...c6
        • 2.Qa7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 7
  • Sets
    • R(k);N_GUARD::S(E),XR(k)
    • R(k);N_GUARD::S(E)
    • S(a);N_GUARD::QAR2(G)
    • S(a);N_GUARD::QAR2(G),XS(a)
    • P(h);OGATE,SBLOCK::QAB1(G)
    • P(h);N_SPINQ(g),OGATE::QAB1(G)
  • Tries
    • Try
      • K(B);CHECK,P-FLIGHT,XB(e)
      • Refutation
        • R(k);CHECK,P_SPINR(k)
    • Try
      • R(F);CHECK,XQ(g)
      • Vars
        • R(k);P_SPINR(k)::S(E)
        • B(e);N_GUARD,P_SPINB(e)::R1(F),XB(e)
        • P(h);OGATE,P_SPINP(h)::QAB1(G)
      • Refutation
        • P(i);XR(F)
  • Actual
    • Q(G);
    • Threat
      • QAR1(G)
    • Vars
      • K(f);N_SPINQ(g),S_FLIGHT::B(A)+K(B),XB(e)
      • R(k);XQ(G)::S(E),XR(k)
      • Q(g);::B(A)+K(B)
      • B(e);N_SPINQ(g)::B(A)+K(B),XP(c)
      • P(h);OGATE,SBLOCK::QAB1(G)
      • P(h);N_SPINQ(g),OGATE::QAB1(G)
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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).