MESON Chess Problem Database

Problem Display
PID: 263850 (8/8/6pB/1K2p3/5P2/1pp3Q1/1r1kP1R1/N1b1Rq2 w - - 0 1)

Nietvelt, Gustaaf Josephus

Tijdschrift vd NSB, 1927

8/8/6pB/1K2p3/5P2/1pp3Q1/1r1kP1R1/N1b1Rq2

#2

8 + 8

6490 yacpdb 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Qxe2+
      • 2.Rgxe2#
    • 1...Qxe1
      • 2.Qd3#
    • 1...Qxf4
      • 2.e4#
    • 1...Rc2
      • 2.Sxb3#
  • Tries
    • 1.Kb4?
      • threat
        • 2.Qxc3#
      • 1...Qxf4+
        • 2.e4#
      • 1...Qxe1
        • 2.Qd3#
      • 1...Rc2
        • 2.Sxb3#
      • 1...c2
        • 2.Qc3#
      • 1...Qf3!
    • 1.Qe3+?
      • 1...Kxe1
        • 2.Qxc1#
      • 1...Kxe3!
    • 1.fxe5+?
      • 1...Qf4
        • 2.Bxf4#
        • 2.e4#
      • 1...g5!
    • 1.f5+?
      • 1...Qf4
        • 2.e4#
      • 1...g5!
  • Keys
    • 1.Kc4!
      • threat
        • 2.Qxc3#
      • 1...Qxe2+
        • 2.Rgxe2#
      • 1...Qxf4+
        • 2.e4#
      • 1...Qxe1
        • 2.Qd3#
      • 1...Qf3
        • 2.exf3#
      • 1...Rc2
        • 2.Sxb3#
      • 1...c2
        • 2.Qc3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • Q(b);CHECK,OGATE,P_SPINQ(b),XP(C)::R1(D),XQ(b)
    • Q(b);N_PINP(C),SBLOCK,XR(B)::QAR1(E)
    • Q(b);N_PINP(C),P_SPINQ(b),XP(F)::R(D)+P(C)
    • R(c);N_GUARD,SBLOCK::S(A),XP(e)
  • Tries
    • Try
      • K(G);N_SPINP(C),P-FLIGHT
      • Threat
        • QAB1(E),XP(f)
      • Vars
        • Q(b);CHECK,N_GUARD,P_SPINQ(b),XP(F)::R(D)+P(C)
        • Q(b);SBLOCK,XR(B)::QAR1(E)
        • R(c);N_GUARD,SBLOCK::S(A),XP(e)
        • P(f);::QAB1(E)
      • Refutation
        • Q(b);
    • Try
      • Q(E);CHECK
      • Vars
        • K(d);OGATE,S_FLIGHT,XR(B)::QAR2(E),XB(a)
      • Refutation
        • K(d);S_FLIGHT,XQ(E)
    • Try
      • P(F);CHECK,XP(g)
      • Refutation
        • P(h);P_SPINP(h)
    • Try
      • P(F);CHECK
      • Vars
        • Q(b);N_PINP(C),P_SPINQ(b)::R(D)+P(C)
      • Refutation
        • P(h);P_SPINP(h)
  • Actual
    • K(G);S_FLIGHT
    • Threat
      • QAB1(E),XP(f)
    • Vars
      • Q(b);CHECK,OGATE,P_SPINQ(b),XP(C)::R1(D),XQ(b)
      • Q(b);CHECK,N_PINP(C),P_SPINQ(b),XP(F)::R(D)+P(C)
      • Q(b);N_PINP(C),SBLOCK,XR(B)::QAR1(E)
      • Q(b);N_PINP(C)::R(D)+P(C),XQ(b)
      • R(c);N_GUARD,SBLOCK::S(A),XP(e)
      • P(f);::QAB1(E)
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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).