Meson Chess Problem Database

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Problem Display

PID: 193715 (8/5p2/5N2/5Rq1/3k4/1K6/2B2P2/6B1 w - - 0 1)

Wurzburg, Otto

Pittsburgh Gazette-Times, 1915

8/5p2/5N2/5Rq1/3k4/1K6/2B2P2/6B1

#2

6 + 3

6490	yacpdb	2019

SOLUTION

SOUND
Sets
- 1...Qc1
  - 2.Rd5#
- 1...Qd2
  - 2.Rd5#
- 1...Qe3+
  - 2.fxe3#
- 1...Qf4
  - 2.Rd5#
- 1...Qh4
  - 2.Rd5#
- 1...Qxf6
  - 2.f3#
  - 2.f4#
- 1...Qh6
  - 2.Rd5#
  - 2.f4#
- 1...Qxg1
  - 2.Rd5#
- 1...Qg3+
  - 2.fxg3#
- 1...Qg4
  - 2.Rd5#
- 1...Qxf5
  - 2.f4#
- 1...Qh5
  - 2.f3#
  - 2.f4#
- 1...Qg6
  - 2.Rd5#
- 1...Qg7
  - 2.Rd5#
- 1...Qg8
  - 2.Rd5#
Tries
- 1.Bb1?
  - 1...Qe3+
    - 2.fxe3#
  - 1...Qg3+
    - 2.fxg3#
  - 1...Qxf6
    - 2.f3#
    - 2.f4#
  - 1...Qxg1
    - 2.Rd5#
  - 1...Qxf5
    - 2.f4#
  - 1...Qc1
    - 2.Rd5#
  - 1...Qd2
    - 2.Rd5#
  - 1...Qf4
    - 2.Rd5#
  - 1...Qh4
    - 2.Rd5#
  - 1...Qh6
    - 2.Rd5#
    - 2.f4#
  - 1...Qg4
    - 2.Rd5#
  - 1...Qh5
    - 2.f3#
    - 2.f4#
  - 1...Qg6
    - 2.Rd5#
  - 1...Qg7
    - 2.Rd5#
  - 1...Qg8
    - 2.Rd5#
  - 1...Qg2!
Keys
- 1.Be4!
  - 1...Qe3+
    - 2.fxe3#
  - 1...Qg3+
    - 2.fxg3#
  - 1...Qxf6
    - 2.f3#
  - 1...Qxg1
    - 2.Rd5#
  - 1...Qxf5
    - 2.f4#
  - 1...Qg2
    - 2.Rd5#
  - 1...Qc1
    - 2.Rd5#
  - 1...Qd2
    - 2.Rd5#
  - 1...Qf4
    - 2.Rd5#
  - 1...Qh4
    - 2.Rd5#
  - 1...Qh6
    - 2.Rd5#
    - 2.f4#
  - 1...Qg4
    - 2.Rd5#
  - 1...Qh5
    - 2.f3#
    - 2.f4#
  - 1...Qg6
    - 2.Rd5#
  - 1...Qg7
    - 2.Rd5#
  - 1...Qg8
    - 2.Rd5#

FEATURES

Static
- TYPE = INCOMPLETE_BLOCK
- CHANGED MATES = 0
- ADDED MATES = 2
- REMOVED MATES = 0
Sets
- Q(b);N_GUARD::R1(E)
- Q(b);CHECK,OGATE::P(C),XQ(b)
- Q(b);N_GUARD,XB(A)::R1(E)
- Q(b);CHECK,OGATE::B(A)+P(C),XQ(b)
- Q(b);N_GUARD,XR(E)::B(A)+P(C)
Tries
- Try
  - B(B);
  - Vars
    - Q(b);CHECK,OGATE::P(C),XQ(b)
    - Q(b);CHECK,OGATE::B(A)+P(C),XQ(b)
    - Q(b);N_GUARD,XB(A)::R1(E)
    - Q(b);N_GUARD,XR(E)::B(A)+P(C)
    - Q(b);N_GUARD::R1(E)
  - Refutation
    - Q(b);
Actual
- B(B);
- Vars
  - Q(b);CHECK,OGATE::P(C),XQ(b)
  - Q(b);CHECK,OGATE::B(A)+P(C),XQ(b)
  - Q(b);N_GUARD,XS(F)::B(A)+P(C)
  - Q(b);N_GUARD,XB(A)::R1(E)
  - Q(b);N_GUARD,XR(E)::B(A)+P(C)
  - Q(b);N_GUARD::R1(E)

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).