MESON Chess Problem Database

Problem Display
PID: 686 (bn6/q1p1Q2K/p5p1/8/N1p4B/8/3kP1R1/1B2R3 w - - 0 1)

Jacobs, Walter William

British Chess Magazine, 1933

bn6/q1p1Q2K/p5p1/8/N1p4B/8/3kP1R1/1B2R3

#2

8 + 8

5088 How to Solve Chess Problems 1945
5064 100 Years of the American Two-move Chess Problem 1962
5454 Near Snap 2017

SOLUTION

  • SOUND
  • Sets
    • 1...Qb7
      • 2.Qg5#
      • 2.e4#
    • 1...Sc6
      • 2.e3#
    • 1...c5
      • 2.e4#
    • 1...c6
      • 2.e3#
  • Tries
    • 1.Qb4+?
      • 1...c3
        • 2.Qxc3#
      • 1...Ke3!
    • 1.Qd6+?
      • 1...Ke3
        • 2.Bf2#
        • 2.Bg5#
      • 1...Qd4
        • 2.Qxd4#
        • 2.e4#
      • 1...Bd5
        • 2.e3#
      • 1...cxd6+!
    • 1.Qd8+?
      • 1...Ke3
        • 2.Bg5#
      • 1...Qd4
        • 2.Qxd4#
        • 2.e4#
      • 1...Bd5
        • 2.e3#
      • 1...Sd7!
    • 1.Qd7+?
      • 1...Ke3
        • 2.Bg5#
      • 1...Qd4
        • 2.Qxd4#
        • 2.e4#
      • 1...Bd5
        • 2.e3#
      • 1...Sxd7!
  • Keys
    • 1.Qg7!
      • threat
        • 2.Qc3#
      • 1...Ke3
        • 2.Bg5#
      • 1...Qe3
        • 2.Qb2#
      • 1...Qd4
        • 2.Qxd4#
      • 1...c3
        • 2.Qxc3#
      • 1...c5
        • 2.e4#
      • 1...c6
        • 2.e3#

Anticipated by 204368(1925)

This anticipates 160588(1952)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 1
  • Sets
    • S(h);S_CUTB(g)::R(D)+P(C)
    • P(f);P_PINQ(G),S_CUTQ(e)::R(D)+P(C)
    • P(f);P_PINQ(G),S_CUTB(g)::R(D)+P(C)
  • Tries
    • Try
      • Q(G);CHECK
      • Vars
        • P(b);P_SPINP(b)::QAB1(G),XP(b)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(G);CHECK
      • Vars
        • B(g);P_SPINB(g)::R(D)+P(C)
      • Refutation
        • P(f);CHECK,XQ(G)
    • Try
      • Q(G);CHECK
      • Vars
        • K(a);S_FLIGHT::B(F)
        • B(g);P_SPINB(g)::R(D)+P(C)
      • Refutation
        • S(h);P_SPINS(h)
    • Try
      • Q(G);CHECK
      • Vars
        • K(a);S_FLIGHT::B(F)
        • B(g);P_SPINB(g)::R(D)+P(C)
      • Refutation
        • S(h);XQ(G)
  • Actual
    • Q(G);
    • Threat
      • QAB1(G)
    • Vars
      • K(a);S_FLIGHT::B(F)
      • Q(e);SBLOCK::QAR2(G)
      • Q(e);N_GUARD::QAR2(G),XQ(e)
      • P(b);::QAB1(G),XP(b)
      • P(f);P_PINQ(G),S_CUTQ(e)::R(D)+P(C)
      • P(f);P_PINQ(G),S_CUTB(g)::R(D)+P(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).