MESON Chess Problem Database

Problem Display
PID: 157382 (1bRN4/2n5/r1q1B3/p1kP4/P1N4R/P2pp3/1r1P2Qp/1b5K w - - 0 1)

Ellerman, Arnoldo

Vita Ligure, 1918

1bRN4/2n5/r1q1B3/p1kP4/P1N4R/P2pp3/1r1P2Qp/1b5K

#2

11 + 11

15148 Sadier Collection 2016

SOLUTION

  • SOUND
  • Sets
    • 1...Qxd5
      • 2.Qxd5#
    • 1...Sb5
      • 2.Sb7#
    • 1...Sxd5
      • 2.Qxd5#
    • 1...Sxe6
      • 2.Sxe6#
    • 1...exd2
      • 2.Qf2#
    • 1...e2
      • 2.Qf2#
  • Tries
    • 1.Qe4?
      • threat
        • 2.Qxe3#
        • 2.Qd4#
      • 1...Qxd5
        • 2.Qxd5#
      • 1...Qxe6
        • 2.Qd4#
      • 1...Sxd5
        • 2.Qxd5#
        • 2.Qd4#
      • 1...Sxe6
        • 2.Sxe6#
      • 1...exd2
        • 2.Qe3#
        • 2.Qd4#
      • 1...Sb5
        • 2.Sb7#
      • 1...e2
        • 2.Qe3#
        • 2.Qd4#
      • 1...Qxa4!
  • Keys
    • 1.Qg5!
      • threat
        • 2.Qxe3#
      • 1...Qxd5+
        • 2.Qxd5#
      • 1...Qxa4
        • 2.d6#
      • 1...Qxe6
        • 2.dxe6#
      • 1...Sxd5
        • 2.Qxd5#
      • 1...Sxe6
        • 2.Sxe6#
      • 1...exd2
        • 2.Qe3#
      • 1...Sb5
        • 2.Sb7#
      • 1...e2
        • 2.Qe3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • Q(i);OGATE,P_PINQ(C),P_SPINS(j),XP(H)::QAR1(C),XQ(i)
    • S(j);P_SPINQ(i),S_CUTR(b)::S(K)
    • S(j);OGATE,P_SPINQ(i),XP(H)::QAR1(C),XS(j)
    • S(j);P_SPINQ(i),XB(I)::S(K),XS(j)
    • P(e);OGATEB,XP(B)::QAB(C)
    • P(e);OGATEB::QAB(C)
  • Tries
    • Try
      • Q(C);
      • Threat
        • DUALS(2)
      • Vars
        • Q(i);OGATE,P_PINQ(C),P_SPINS(j),XP(H)::QAR1(C),XQ(i)
        • Q(i);P_SPINS(j),XB(I)::QAB1(C)
        • S(j);P_SPINQ(i),XB(I)::S(K),XS(j)
        • S(j);P_SPINQ(i),S_CUTR(b)::S(K)
      • Refutation
        • Q(i);P_SPINS(j),XP(E)
  • Actual
    • Q(C);P_SPINP(H)
    • Threat
      • QAB(C),XP(e)
    • Vars
      • Q(i);CHECK,OGATE,P_SPINQ(i),P_SPINS(j),XP(H)::QAR1(C),XQ(i)
      • Q(i);N_PINP(H),P_SPINS(j),XP(E)::QAR(C)+P(H)
      • Q(i);N_PINP(H),P_SPINS(j),XB(I)::QAR(C)+P(H),XQ(i)
      • S(j);OGATE,P_SPINQ(i),P_SPINS(j),XP(H)::QAR1(C),XS(j)
      • S(j);P_SPINQ(i),XB(I)::S(K),XS(j)
      • P(e);XP(B)::QAB(C)
      • S(j);P_SPINQ(i),S_CUTR(b)::S(K)
      • P(e);::QAB(C)
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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).