Meson Chess Problem Database

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Problem Display

PID: 193476 (8/8/8/8/3BK3/8/3pk3/6Q1 w - - 0 1)

Seiferth, ?

Bitterfelder Anzeiger, 1915

8/8/8/8/3BK3/8/3pk3/6Q1

#2

3 + 2

6490	yacpdb	2019
5454	Near Snap	2021

SOLUTION

SOUND
Sets
- 1...d1Q
  - 2.Qf2#
- 1...d1B
  - 2.Qf2#
- 1...d1R
  - 2.Qf2#
Tries
- 1.Be3?
  - 1...d1Q
    - 2.Qf2#
  - 1...d1B
    - 2.Qf2#
  - 1...d1R
    - 2.Qf2#
  - 1...d1S!
- 1.Bc5?
  - 1...d1Q
    - 2.Qf2#
  - 1...d1B
    - 2.Qf2#
  - 1...d1R
    - 2.Qf2#
  - 1...d1S!
- 1.Bb6?
  - 1...d1Q
    - 2.Qf2#
  - 1...d1B
    - 2.Qf2#
  - 1...d1R
    - 2.Qf2#
  - 1...d1S!
- 1.Ba7?
  - 1...d1Q
    - 2.Qf2#
  - 1...d1B
    - 2.Qf2#
  - 1...d1R
    - 2.Qf2#
  - 1...d1S!
- 1.Qe3+?
  - 1...Kf1
    - 2.Qf2#
  - 1...Kd1!
Keys
- 1.Bc3!
  - 1...d1Q
    - 2.Qg2#
  - 1...d1S
    - 2.Qe1#
  - 1...d1B
    - 2.Qe1#
    - 2.Qg2#
  - 1...d1R
    - 2.Qg2#

This anticipates 237701(1988), 240515(2011)

FEATURES

Static
- TYPE = INCOMPLETE_BLOCK
- CHANGED MATES = 2
- ADDED MATES = 1
- REMOVED MATES = 1
Sets
- P(a);SBLOCK::QAR1(A)
Tries
- Try
  - B(B);
  - Vars
    - P(a);SBLOCK::QAR1(A)
  - Refutation
    - P(a);
- Try
  - B(B);
  - Vars
    - P(a);SBLOCK::QAR1(A)
  - Refutation
    - P(a);
- Try
  - B(B);
  - Vars
    - P(a);SBLOCK::QAR1(A)
  - Refutation
    - P(a);
- Try
  - B(B);
  - Vars
    - P(a);SBLOCK::QAR1(A)
  - Refutation
    - P(a);
- Try
  - Q(A);CHECK
  - Vars
    - K(b);S_FLIGHT::QAR1(A)
  - Refutation
    - K(b);S_FLIGHT
Actual
- B(B);
- Vars
  - P(a);SBLOCK::QAR2(A)
  - P(a);N_GUARD::QAR1(A)

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).