MESON Chess Problem Database

Problem Display
PID: 175514 (8/8/2p1N3/K1p1p3/2p1k1p1/4NbR1/2Pn4/1BB1Q3 w - - 0 1)

Nelson, Nels H

Philadelphia Times, 1899

8/8/2p1N3/K1p1p3/2p1k1p1/4NbR1/2Pn4/1BB1Q3

#2

8 + 8

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Sf1
      • 2.c3#
    • 1...Sb3+
      • 2.cxb3#
  • Tries
    • 1.Sg5+?
      • 1...Kd4
        • 2.Qxd2#
      • 1...Kf4!
    • 1.Qe2?
      • 1...Sb3+
        • 2.cxb3#
      • 1...Sxb1
        • 2.Qxc4#
      • 1...Bh1
        • 2.Rxg4#
        • 2.Qxg4#
      • 1...Bg2
        • 2.Rxg4#
        • 2.Qxg4#
      • 1...Sf1
        • 2.Qxc4#
        • 2.c3#
      • 1...c3
        • 2.Qd3#
      • 1...Bxe2!
  • Keys
    • 1.Qf1!
      • 1...Sb3+
        • 2.cxb3#
      • 1...Kxe3
        • 2.Qe1#
      • 1...Sxb1
        • 2.Qxc4#
      • 1...Sxf1
        • 2.c3#
      • 1...Bd1
        • 2.Qf5#
      • 1...Bh1
        • 2.Qf5#
      • 1...Be2
        • 2.Qf5#
      • 1...Bg2
        • 2.Qf5#
      • 1...c3
        • 2.Qd3#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 7
    • REMOVED MATES = 0
  • Sets
    • S(a);N_GUARD::B(A)+P(D)
    • S(a);CHECK,OGATE::B(A)+P(D),XS(a)
  • Tries
    • Try
      • S(H);CHECK
      • Vars
        • K(d);P-FLIGHT::QAR2(C),XS(a)
      • Refutation
        • K(d);P-FLIGHT
    • Try
      • Q(C);
      • Vars
        • S(a);CHECK,OGATE::B(A)+P(D),XS(a)
        • S(a);N_GUARD,XB(A)::QAR2(C),XP(c)
        • P(c);N_GUARD::QAB1(C)
      • Refutation
        • B(b);XQ(C)
  • Actual
    • Q(C);
    • Vars
      • S(a);CHECK,OGATE::B(A)+P(D),XS(a)
      • K(d);OGATEB,P-FLIGHT,P_SPINB(b),P_SPINS(a),XS(E)::QAR2(C)
      • S(a);N_GUARD,XB(A)::QAR2(C),XP(c)
      • S(a);N_GUARD,XQ(C)::B(A)+P(D)
      • B(b);OGATE::QAB1(C)
      • P(c);N_GUARD::QAB1(C)
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).