MESON Chess Problem Database

Problem Display
PID: 182374 (r7/8/8/2P5/3B4/1Q1K4/BP6/k7 w - - 0 1)

van Dijk, Johannes

Tijdschrift vd NSB, 1906

r7/8/8/2P5/3B4/1Q1K4/BP6/k7

#2

6 + 2

5454 Near Snap 2018
6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Rxa2
      • 2.Qd1#
    • 1...Ra3
      • 2.bxa3#
  • Tries
    • 1.Qc2?
      • threat
        • 2.Qb1#
        • 2.b3#
        • 2.b4#
      • 1...Ra3+
        • 2.bxa3#
        • 2.b3#
      • 1...Rxa2
        • 2.Qd1#
        • 2.Qc1#
      • 1...Ra4
        • 2.Qb1#
        • 2.b4#
      • 1...Rd8
        • 2.Qb1#
      • 1...Kxa2!
    • 1.Qc4?
      • threat
        • 2.b4#
      • 1...Ra3+
        • 2.bxa3#
      • 1...Rxa2
        • 2.Qc1#
      • 1...Rd8!
    • 1.Qe6?
      • threat
        • 2.b4#
      • 1...Ra3+
        • 2.bxa3#
      • 1...Rxa2
        • 2.Qe1#
      • 1...Rd8!
    • 1.Qf7?
      • threat
        • 2.b4#
      • 1...Ra3+
        • 2.bxa3#
      • 1...Rxa2
        • 2.Qf1#
      • 1...Rd8!
  • Keys
    • 1.Qd5!
      • threat
        • 2.b4#
      • 1...Ra3+
        • 2.bxa3#
      • 1...Rxa2
        • 2.Qh1#

This anticipates 53018(1933)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 0
    • REMOVED MATES = 0
  • Sets
    • R(b);SBLOCK,XB(A)::QAR(C)
    • R(b);OGATE,P_PINQ(C)::B(E)+P(B),XR(b)
  • Tries
    • Try
      • Q(C);
      • Threat
        • DUALS(3)
      • Vars
        • R(b);P_PINB(E)::QAR1(C)
      • Refutation
        • K(a);P-FLIGHT,XB(A)
    • Try
      • Q(C);
      • Threat
        • B(E)+P(B)
      • Vars
        • R(b);CHECK,OGATE::B(E)+P(B),XR(b)
        • R(b);SBLOCK,XB(A)::QAR2(C)
      • Refutation
        • R(b);P_PINB(E)
    • Try
      • Q(C);
      • Threat
        • B(E)+P(B)
      • Vars
        • R(b);CHECK,OGATE::B(E)+P(B),XR(b)
        • R(b);SBLOCK,XB(A)::QAR(C)
      • Refutation
        • R(b);P_PINB(E)
    • Try
      • Q(C);
      • Threat
        • B(E)+P(B)
      • Vars
        • R(b);CHECK,OGATE::B(E)+P(B),XR(b)
        • R(b);SBLOCK,XB(A)::QAR(C)
      • Refutation
        • R(b);P_PINB(E)
  • Actual
    • Q(C);
    • Threat
      • B(E)+P(B)
    • Vars
      • R(b);CHECK,OGATE::B(E)+P(B),XR(b)
      • R(b);SBLOCK,XB(A)::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).