MESON Chess Problem Database

Problem Display
PID: 139477 (2rR4/2N2b2/p6r/3B1PP1/1npkNBRp/1Q1p1P1K/n1qP4/8 w - - 0 1)

Ellerman, Arnoldo

Parallele 50, 1950

2rR4/2N2b2/p6r/3B1PP1/1npkNBRp/1Q1p1P1K/n1qP4/8

#2

12 + 11

SOLUTION

  • SOUND
  • Sets
    • 1...Qb1
      • 2.Qxc4#
    • 1...Qd1
      • 2.Qxc4#
    • 1...Qb2
      • 2.Qxc4#
    • 1...Qxd2
      • 2.Qxc4#
    • 1...Bg6
      • 2.Se6#
    • 1...Sc3
      • 2.Qxc4#
    • 1...Sc6
      • 2.Qb6#
    • 1...c3
      • 2.Qc4#
    • 1...a5
      • 2.Sb5#
  • Tries
    • 1.Be6+?
      • 1...Sd5
        • 2.Rxd5#
        • 2.Qb6#
      • 1...Rxd8!
  • Keys
    • 1.Sf6!
      • threat
        • 2.Bd6#
      • 1...Kc5
        • 2.Be3#
      • 1...Qxd2
        • 2.Qxc4#
      • 1...Bxd5
        • 2.Se6#
      • 1...Sxd5
        • 2.Qb6#
      • 1...Bh5
        • 2.Se6#
      • 1...Sc3
        • 2.Qxc4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 7
  • Sets
    • Q(b);N_GUARD::QAR1(B),XP(e)
    • Q(b);N_GUARD,XP(A)::QAR1(B),XP(e)
    • B(j);N_GUARD,S_CUTR(i)::S(K)
    • S(a);S_CUTQ(b)::QAR1(B),XP(e)
    • S(d);OGATE::QAB(B)
    • P(e);S_CUTQ(b)::QAR1(B)
    • P(h);N_GUARD::S(K)
  • Tries
    • Try
      • B(H);CHECK
      • Refutation
        • R(k);XR(L)
  • Actual
    • S(E);
    • Threat
      • R(G)+B(F)
    • Vars
      • K(f);S_FLIGHT::B(F)
      • Q(b);N_GUARD,XP(A)::QAR1(B),XP(e)
      • B(j);N_GUARD,P_SPINB(j),XB(H)::S(K)
      • S(d);OGATE,P_SPINS(d),XB(H)::QAB(B)
      • B(j);N_GUARD::S(K)
      • S(a);S_CUTQ(b)::QAR1(B),XP(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).