MESON Chess Problem Database

Problem Display
PID: 140401 (Q4B2/p1Kp2pq/P3p3/3N2nR/P1kP4/1r2Pp1b/B2P1N2/r7 w - - 0 1)

Ellerman, Arnoldo

Problemas, 1945

Q4B2/p1Kp2pq/P3p3/3N2nR/P1kP4/1r2Pp1b/B2P1N2/r7

#2

12 + 11

SOLUTION

  • SOUND
  • Sets
    • 1...Qg8
      • 2.d3#
    • 1...Qxh5
      • 2.d3#
    • 1...Qh6
      • 2.d3#
    • 1...Qh8
      • 2.d3#
    • 1...Se4
      • 2.d3#
    • 1...d6
      • 2.Qc6#
    • 1...g6
      • 2.d3#
  • Tries
    • 1.Qb7?
      • threat
        • 2.Bxb3#
        • 2.Qxb3#
        • 2.Qb5#
      • 1...Qb1
        • 2.Qb5#
      • 1...Qc2
        • 2.Qb5#
      • 1...Qd3
        • 2.Qb5#
      • 1...Rb1
        • 2.Qb5#
      • 1...Rxa2!
    • 1.Qxa7?
      • threat
        • 2.Sb6#
        • 2.Qc5#
      • 1...Kxd5
        • 2.Bxb3#
        • 2.Qc5#
      • 1...Rxa2
        • 2.Qc5#
      • 1...exd5
        • 2.Qc5#
      • 1...Se4
        • 2.Sb6#
        • 2.d3#
      • 1...d6!
    • 1.Qb8?
      • threat
        • 2.Bxb3#
        • 2.Qxb3#
        • 2.Qb5#
      • 1...Kxd5
        • 2.Bxb3#
        • 2.Qxb3#
        • 2.Qb5#
      • 1...Qb1
        • 2.Qb5#
      • 1...Qc2
        • 2.Qb5#
      • 1...Qd3
        • 2.Qb5#
      • 1...Rb1
        • 2.Qb5#
      • 1...Rxa2!
  • Keys
    • 1.Qc8!
      • threat
        • 2.Kd6#
      • 1...Kxd5
        • 2.Bxb3#
      • 1...exd5
        • 2.Kd8#
      • 1...Se4
        • 2.d3#
      • 1...Sf7
        • 2.Kxd7#
      • 1...d6
        • 2.Kxd6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 5
  • Sets
    • Q(k);N_GUARD::P(B)
    • Q(k);N_GUARD,XR(H)::P(B)
    • S(f);S_CUTQ(k)::P(B)
    • P(i);N_GUARD::QAR2(K)
    • P(j);S_CUTQ(k)::P(B)
  • Tries
    • Try
      • Q(K);
      • Threat
        • DUALS(3)
      • Vars
        • Q(k);::QAB1(K)
        • R(a);::QAB1(K)
      • Refutation
        • R(a);N_SPINR(b),XB(A)
    • Try
      • Q(K);XP(h)
      • Threat
        • DUALS(2)
      • Vars
        • R(a);N_SPINR(b),XB(A)::QAR1(K)
        • P(g);XS(G)::QAR1(K)
      • Refutation
        • P(i);
    • Try
      • Q(K);
      • Threat
        • DUALS(3)
      • Vars
        • Q(k);::QAB1(K)
        • R(a);::QAB1(K)
      • Refutation
        • R(a);N_SPINR(b),XB(A)
  • Actual
    • Q(K);
    • Threat
      • QAR(K)+K(J)
    • Vars
      • K(e);P_SPINS(f),S_FLIGHT,XS(G)::B(A),XR(b)
      • P(g);SBLOCK,XS(G)::QAR(K)+K(J)
      • S(f);S_CUTQ(k)::P(B)
      • S(f);::QAR(K)+K(J),XP(i)
      • P(i);::QAR(K)+K(J),XP(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).