MESON Chess Problem Database

Problem Display
PID: 144347 (4Rqr1/4n3/1p1Q3N/3P3B/n1p4B/KR4P1/2N1Pkpp/5bb1 w - - 0 1)

Ellerman, Arnoldo

Il Problema, 1934

4Rqr1/4n3/1p1Q3N/3P3B/n1p4B/KR4P1/2N1Pkpp/5bb1

#2

11 + 11

274 diagrammes 1973
136 Problem Observer 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Qg7
      • 2.Qf4#
    • 1...Qf4
      • 2.Qxf4#
    • 1...Qxe8
      • 2.Qf4#
    • 1...Rxg3
      • 2.Bxg3#
      • 2.Qxg3#
    • 1...Sb2
      • 2.Qxb6#
    • 1...Sc3
      • 2.Qxb6#
    • 1...Sxd5
      • 2.g4#
    • 1...Sf5
      • 2.Rf3#
    • 1...Sc6
      • 2.g4#
    • 1...Sg6
      • 2.Sg4#
    • 1...Sc8
      • 2.g4#
  • Tries
    • 1.Rxf8+?
      • 1...Sf5
        • 2.Rxf5#
        • 2.Qf4#
      • 1...Rxf8!
    • 1.Qxb6+?
      • 1...Sc5
        • 2.Qxc5#
      • 1...Sxb6!
  • Keys
    • 1.Qb4!
      • threat
        • 2.Qe1#
      • 1...Sxd5
        • 2.g4#
      • 1...Sc3
        • 2.Qxb6#
      • 1...Sf5
        • 2.Rf3#
      • 1...Sc6
        • 2.g4#
      • 1...Sg6
        • 2.Sg4#
      • 1...Sc8
        • 2.g4#
      • 1...c3
        • 2.Qd4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 4
  • Sets
    • Q(j);N_GUARD::QAR2(I)
    • Q(j);N_GUARD::QAR2(I),XQ(j)
    • Q(j);N_GUARD,XR(K)::QAR2(I)
    • S(f);N_GUARD::QAB(I),XP(h)
    • S(i);P_PINQ(I),XP(G)::B(F)+P(E)
    • S(i);P_PINQ(I),S_CUTQ(j)::R1(D)
    • S(i);P_PINQ(I)::B(F)+P(E)
    • S(i);P_PINQ(I),S_CUTR(k)::S(J)
  • Tries
    • Try
      • R(K);CHECK,XQ(j)
      • Refutation
        • R(k);XR(K)
    • Try
      • Q(I);CHECK,XP(h)
      • Vars
        • S(f);N_GUARD,P_SPINS(f)::QAB(I),XS(f)
      • Refutation
        • S(f);XQ(I)
  • Actual
    • Q(I);
    • Threat
      • QAB1(I)
    • Vars
      • S(i);P_PINQ(I),XP(G)::B(F)+P(E)
      • S(f);N_GUARD::QAB(I),XP(h)
      • S(i);P_PINQ(I),S_CUTQ(j)::R1(D)
      • S(i);P_PINQ(I)::B(F)+P(E)
      • S(i);P_PINQ(I),S_CUTR(k)::S(J)
      • P(g);OGATE::QAB(I)
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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).