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Problem Display

PID: 172170 (8/4p3/2R1P3/B3knK1/5N2/5P2/5P2/8 w - - 0 1)

Arnstam, Knut Anders Olof

3rd HM., Schackvarlden TT, 1943

8/4p3/2R1P3/B3knK1/5N2/5P2/5P2/8

#2

7 + 3

5454	Near Snap	2018
6490	yacpdb	2018

SOLUTION

SOUND
Sets
- 1...Kd4
  - 2.Bc3#
- 1...Se3
  - 2.Bc3#
- 1...Sg3
  - 2.Bc3#
- 1...Sd4
  - 2.Bc7#
- 1...Sh4
  - 2.Bc3#
- 1...Sd6
  - 2.Bc3#
- 1...Sh6
  - 2.Bc3#
- 1...Sg7
  - 2.Bc3#
Tries
- 1.Be1?
  - 1...Kd4
    - 2.Bc3#
  - 1...Se3
    - 2.Bc3#
  - 1...Sg3
    - 2.Bc3#
  - 1...Sh4
    - 2.Bc3#
  - 1...Sd6
    - 2.Bc3#
  - 1...Sh6
    - 2.Bc3#
  - 1...Sg7
    - 2.Bc3#
  - 1...Sd4!
- 1.Bd2?
  - 1...Kd4
    - 2.Bc3#
  - 1...Se3
    - 2.Bc3#
  - 1...Sg3
    - 2.Bc3#
  - 1...Sh4
    - 2.Bc3#
  - 1...Sd6
    - 2.Bc3#
  - 1...Sh6
    - 2.Bc3#
  - 1...Sg7
    - 2.Bc3#
  - 1...Sd4!
- 1.Bb4?
  - 1...Kd4
    - 2.Bc3#
  - 1...Se3
    - 2.Bc3#
  - 1...Sg3
    - 2.Bc3#
  - 1...Sh4
    - 2.Bc3#
  - 1...Sd6
    - 2.Bc3#
  - 1...Sh6
    - 2.Bc3#
  - 1...Sg7
    - 2.Bc3#
  - 1...Sd4!
- 1.Ra6?
  - 1...Se3
    - 2.Bc3#
  - 1...Sg3
    - 2.Bc3#
  - 1...Sd4
    - 2.Bc7#
  - 1...Sh4
    - 2.Bc3#
  - 1...Sd6
    - 2.Bc3#
  - 1...Sh6
    - 2.Bc3#
  - 1...Sg7
    - 2.Bc3#
  - 1...Kd4!
Keys
- 1.Rc4!
  - 1...Kd6
    - 2.Bc7#
  - 1...Se3
    - 2.Bc7#
  - 1...Sg3
    - 2.Bc7#
  - 1...Sd4
    - 2.Bc7#
  - 1...Sh4
    - 2.Bc7#
  - 1...Sd6
    - 2.Bc3#
  - 1...Sh6
    - 2.Bc7#
  - 1...Sg7
    - 2.Bc7#

This anticipates 74708(1969)

FEATURES

Static
- TYPE = MUTATE
- CHANGED MATES = 5
- ADDED MATES = 1
- REMOVED MATES = 1
Sets
- K(a);S_FLIGHT::B(D)
- S(b);N_GUARD::B(D)
- S(b);N_GUARD,SBLOCK::B(D)
Tries
- Try
  - B(D);
  - Vars
    - K(a);S_FLIGHT::B(D)
    - S(b);N_GUARD::B(D)
  - Refutation
    - S(b);
- Try
  - B(D);
  - Vars
    - K(a);S_FLIGHT::B(D)
    - S(b);N_GUARD::B(D)
  - Refutation
    - S(b);
- Try
  - B(D);
  - Vars
    - K(a);S_FLIGHT::B(D)
    - S(b);N_GUARD::B(D)
  - Refutation
    - S(b);
- Try
  - R(F);
  - Vars
    - S(b);N_GUARD::B(D)
    - S(b);N_GUARD,SBLOCK::B(D)
  - Refutation
    - K(a);S_FLIGHT
Actual
- R(F);
- Vars
  - K(a);S_FLIGHT::B(D)
  - S(b);N_GUARD::B(D)
  - S(b);N_GUARD,SBLOCK::B(D)

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).