MESON Chess Problem Database

Problem Display
PID: 224823 (1Q6/p7/BPp5/1pk1NP2/4P3/3p4/2nN1K1B/R1R5 w - - 0 1)

Jonsson, Hermann Leonard

2nd Prize, Chess Monthly, 1887

1Q6/p7/BPp5/1pk1NP2/4P3/3p4/2nN1K1B/R1R5

#2

11 + 6

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...b4
      • 2.Sb3#
  • Tries
    • 1.Sg4?
      • 1...Kd4
        • 2.Qe5#
      • 1...axb6
        • 2.Qd6#
      • 1...b4
        • 2.Sb3#
      • 1...Kb4!
    • 1.Sxc6?
      • 1...Kxc6
        • 2.Qd6#
        • 2.Qc7#
      • 1...axb6
        • 2.Qd6#
      • 1...b4!
    • 1.Sg6?
      • 1...Kd4
        • 2.Qe5#
      • 1...axb6
        • 2.Qd6#
      • 1...b4
        • 2.Sb3#
      • 1...Kb4!
    • 1.Sd7+?
      • 1...Kd4
        • 2.Be5#
        • 2.Qe5#
        • 2.Qh8#
      • 1...Kb4!
    • 1.Sf7?
      • 1...Kd4
        • 2.Qe5#
      • 1...axb6
        • 2.Qd6#
      • 1...b4
        • 2.Sb3#
      • 1...Kb4!
    • 1.Ra4?
      • threat
        • 2.Sb3#
        • 2.Sxd3#
        • 2.Sd7#
      • 1...b4
        • 2.Sb3#
      • 1...bxa4!
    • 1.Rxc2+?
      • 1...Kb4
        • 2.Sxd3#
        • 2.Sxc6#
      • 1...Kd4
        • 2.Sef3#
        • 2.Sxc6#
        • 2.Qd6#
        • 2.Qd8#
      • 1...dxc2!
    • 1.Qd6+?
      • 1...Kxb6
        • 2.Sd7#
        • 2.Qxc6#
      • 1...Kxd6!
    • 1.Qf8+?
      • 1...Kxb6
        • 2.Sd7#
      • 1...Kd4!
  • Keys
    • 1.Qh8!
      • 1...Kb4
        • 2.Sxd3#
      • 1...Kd4
        • 2.Sd7#
      • 1...Kxb6
        • 2.Sd7#
      • 1...Kd6
        • 2.Qf8#
      • 1...axb6
        • 2.Sxd3#
      • 1...b4
        • 2.Sd7#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
    • P(c);SBLOCK::S(C)
  • Tries
    • Try
      • S(G);
      • Vars
        • K(d);N_SPINS(a),S_FLIGHT::QAB1(K)
        • P(f);SBLOCK,XP(J)::QAB1(K)
        • P(c);SBLOCK::S(C)
      • Refutation
        • K(d);N_SPINS(a),S_FLIGHT
    • Try
      • S(G);XP(e)
      • Vars
        • P(f);SBLOCK,XP(J)::QAB1(K)
      • Refutation
        • P(c);
    • Try
      • S(G);
      • Vars
        • K(d);N_SPINS(a),S_FLIGHT::QAB1(K)
        • P(f);SBLOCK,XP(J)::QAB1(K)
        • P(c);SBLOCK::S(C)
      • Refutation
        • K(d);N_SPINS(a),S_FLIGHT
    • Try
      • S(G);CHECK
      • Refutation
        • K(d);N_SPINS(a),S_FLIGHT
    • Try
      • S(G);
      • Vars
        • K(d);N_SPINS(a),S_FLIGHT::QAB1(K)
        • P(f);SBLOCK,XP(J)::QAB1(K)
        • P(c);SBLOCK::S(C)
      • Refutation
        • K(d);N_SPINS(a),S_FLIGHT
    • Try
      • R(A);
      • Threat
        • DUALS(3)
      • Vars
        • P(c);::S(C)
      • Refutation
        • P(c);XR(A)
    • Try
      • R(B);CHECK,XS(a)
      • Refutation
        • P(b);XR(B)
    • Try
      • Q(K);CHECK
      • Refutation
        • K(d);N_SPINS(a),S_FLIGHT,XQ(K)
    • Try
      • Q(K);CHECK
      • Vars
        • K(d);N_SPINS(a),S_FLIGHT,XP(J)::S(G)
      • Refutation
        • K(d);N_SPINS(a),S_FLIGHT
  • Actual
    • Q(K);
    • Vars
      • K(d);N_SPINS(a),S_FLIGHT::S(G),XP(b)
      • K(d);N_SPINS(a),S_FLIGHT::QAB(K)+S(G)
      • K(d);N_SPINS(a),S_FLIGHT,XP(J)::S(G)
      • K(d);N_SPINS(a),S_FLIGHT::QAB(K)
      • P(f);SBLOCK,XP(J)::S(G),XP(b)
      • P(c);SBLOCK::S(G)
HTML5 logo

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).