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Problem Display

PID: 153641 (5q2/3bpp1N/7b/8/1p3Bk1/6p1/2B5/1K3R1R w - - 0 1)

McAllister, George W

Good Companions (April), 1916

5q2/3bpp1N/7b/8/1p3Bk1/6p1/2B5/1K3R1R

#2

6 + 8

SOLUTION

SOUND
Sets
- 1...e5
  - 2.Sf6#
- 1...e6
  - 2.Sf6#
- 1...f5
  - 2.Bd1#
Tries
- 1.Be5?
  - threat
    - 2.Bd1#
  - 1...Bf4
    - 2.Rxf4#
  - 1...Ba4
    - 2.Bf5#
  - 1...Bb5
    - 2.Bf5#
  - 1...Bf5
    - 2.Bxf5#
  - 1...Bc6
    - 2.Bf5#
  - 1...Qa8!
- 1.Bg5?
  - threat
    - 2.Bd1#
    - 2.Rf4#
    - 2.Rh4#
  - 1...Bxg5
    - 2.Bd1#
  - 1...Qa8
    - 2.Rf4#
    - 2.Rh4#
  - 1...Qb8
    - 2.Bd1#
    - 2.Rh4#
  - 1...Ba4
    - 2.Bf5#
    - 2.Rf4#
    - 2.Rh4#
  - 1...Bb5
    - 2.Bf5#
    - 2.Rf4#
    - 2.Rh4#
  - 1...Bf5
    - 2.Bxf5#
    - 2.Rf4#
    - 2.Rh4#
  - 1...Bc6
    - 2.Bf5#
    - 2.Rf4#
    - 2.Rh4#
  - 1...e5
    - 2.Bd1#
    - 2.Rh4#
  - 1...g2!
- 1.Bd6?
  - threat
    - 2.Bd1#
  - 1...Bf4
    - 2.Rxf4#
  - 1...Ba4
    - 2.Bf5#
  - 1...Bb5
    - 2.Bf5#
  - 1...Bf5
    - 2.Bxf5#
  - 1...Bc6
    - 2.Bf5#
  - 1...Qa8!
- 1.Bxh6?
  - threat
    - 2.Bd1#
    - 2.Rf4#
  - 1...Qxh6
    - 2.Bd1#
  - 1...Qa8
    - 2.Rf4#
  - 1...Qb8
    - 2.Bd1#
  - 1...Ba4
    - 2.Bf5#
    - 2.Rf4#
  - 1...Bb5
    - 2.Bf5#
    - 2.Rf4#
  - 1...Bf5
    - 2.Bxf5#
    - 2.Rf4#
  - 1...Bc6
    - 2.Bf5#
    - 2.Rf4#
  - 1...e5
    - 2.Sf6#
    - 2.Bd1#
  - 1...g2!
- 1.Bc7?
  - threat
    - 2.Bd1#
  - 1...Bf4
    - 2.Rxf4#
  - 1...Ba4
    - 2.Bf5#
  - 1...Bb5
    - 2.Bf5#
  - 1...Bf5
    - 2.Bxf5#
  - 1...Bc6
    - 2.Bf5#
  - 1...Qa8!
Keys
- 1.Bb8!
  - threat
    - 2.Bd1#
  - 1...Bf4
    - 2.Rxf4#
  - 1...Ba4
    - 2.Bf5#
  - 1...Bb5
    - 2.Bf5#
  - 1...Bf5
    - 2.Bxf5#
  - 1...Bc6
    - 2.Bf5#

FEATURES

Static
- TYPE = THREAT
- CHANGED MATES = 0
- ADDED MATES = 5
- REMOVED MATES = 3
Sets
- P(f);N_GUARD::S(F)
- P(g);SBLOCK::B(D)
Tries
- Try
  - B(E);
  - Threat
    - B(D)
  - Vars
    - B(d);N_GUARD::R1(B),XB(d)
    - B(e);N_GUARD::B(D)
    - B(e);N_GUARD,P_PINB(D)::B(D),XB(e)
  - Refutation
    - Q(h);
- Try
  - B(E);
  - Threat
    - DUALS(3)
  - Vars
    - B(d);XB(E)::B(D)
  - Refutation
    - P(a);
- Try
  - B(E);
  - Threat
    - B(D)
  - Vars
    - B(d);N_GUARD::R1(B),XB(d)
    - B(e);N_GUARD::B(D)
    - B(e);N_GUARD,P_PINB(D)::B(D),XB(e)
  - Refutation
    - Q(h);
- Try
  - B(E);XB(d)
  - Threat
    - DUALS(2)
  - Vars
    - Q(h);XB(E)::B(D)
    - Q(h);::R1(B)
    - Q(h);::B(D)
  - Refutation
    - P(a);
- Try
  - B(E);
  - Threat
    - B(D)
  - Vars
    - B(d);N_GUARD::R1(B),XB(d)
    - B(e);N_GUARD::B(D)
    - B(e);N_GUARD,P_PINB(D)::B(D),XB(e)
  - Refutation
    - Q(h);
Actual
- B(E);
- Threat
  - B(D)
- Vars
  - B(d);N_GUARD::R1(B),XB(d)
  - B(e);N_GUARD::B(D)
  - B(e);N_GUARD,P_PINB(D)::B(D),XB(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).