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Problem Display

PID: 175022 (K7/8/3p1Q2/2B4B/4kb2/6p1/1N4R1/8 w - - 0 1)

White, Alain Campbell

American Chess World, 1901

K7/8/3p1Q2/2B4B/4kb2/6p1/1N4R1/8

#2

6 + 4

6490	yacpdb	2018

SOLUTION

SOUND
Sets
- 1...Bc1
  - 2.Bf3#
- 1...Bd2
  - 2.Bf3#
- 1...Be3
  - 2.Bf3#
- 1...Be5
  - 2.Bf3#
  - 2.Qf3#
- 1...Bg5
  - 2.Bf3#
- 1...Bh6
  - 2.Bf3#
Tries
- 1.Bg1?
  - 1...Kd5
    - 2.Bf3#
  - 1...Bc1
    - 2.Bf3#
  - 1...Bd2
    - 2.Bf3#
  - 1...Be3
    - 2.Bf3#
  - 1...Be5
    - 2.Bf3#
    - 2.Qf3#
  - 1...Bg5
    - 2.Bf3#
  - 1...Bh6
    - 2.Bf3#
  - 1...d5!
- 1.Bb6?
  - 1...Kd5
    - 2.Bf3#
  - 1...Bc1
    - 2.Bf3#
  - 1...Bd2
    - 2.Bf3#
  - 1...Be3
    - 2.Bf3#
  - 1...Be5
    - 2.Bf3#
    - 2.Qf3#
  - 1...Bg5
    - 2.Bf3#
  - 1...Bh6
    - 2.Bf3#
  - 1...d5!
- 1.Bxd6?
  - 1...Ke3
    - 2.Re2#
    - 2.Qxf4#
  - 1...Kd5
    - 2.Bf3#
  - 1...Be5
    - 2.Qxe5#
  - 1...Bc1
    - 2.Qe5#
  - 1...Bd2
    - 2.Qe5#
  - 1...Be3
    - 2.Bf3#
    - 2.Qe5#
  - 1...Bg5
    - 2.Qe5#
  - 1...Bh6
    - 2.Qe5#
  - 1...Bxd6!
- 1.Ba7?
  - 1...Kd5
    - 2.Bf3#
  - 1...Bc1
    - 2.Bf3#
  - 1...Bd2
    - 2.Bf3#
  - 1...Be3
    - 2.Bf3#
  - 1...Be5
    - 2.Bf3#
    - 2.Qf3#
  - 1...Bg5
    - 2.Bf3#
  - 1...Bh6
    - 2.Bf3#
  - 1...d5!
- 1.Re2+?
  - 1...Be3
    - 2.Bf3#
  - 1...Kd5!
Keys
- 1.Be3!
  - 1...Kxe3
    - 2.Re2#
  - 1...Kd5
    - 2.Bf3#
  - 1...Bxe3
    - 2.Bf3#
  - 1...d5
    - 2.Qxf4#
  - 1...Be5
    - 2.Qf3#
  - 1...Bg5
    - 2.Qe6#
  - 1...Bh6
    - 2.Qe6#

FEATURES

Static
- TYPE = INCOMPLETE_BLOCK
- CHANGED MATES = 2
- ADDED MATES = 4
- REMOVED MATES = 2
Sets
- B(c);::B(D)
Tries
- Try
  - B(C);
  - Vars
    - K(b);S_FLIGHT::B(D)
    - B(c);::B(D)
  - Refutation
    - P(d);
- Try
  - B(C);
  - Vars
    - K(b);S_FLIGHT::B(D)
    - B(c);::B(D)
  - Refutation
    - P(d);
- Try
  - B(C);XP(d)
  - Vars
    - K(b);S_FLIGHT::B(D)
    - B(c);N_GUARD::QAR1(E),XB(c)
    - B(c);N_GUARD::QAR1(E)
  - Refutation
    - B(c);XB(C)
- Try
  - B(C);
  - Vars
    - K(b);S_FLIGHT::B(D)
    - B(c);::B(D)
  - Refutation
    - P(d);
- Try
  - R(B);CHECK
  - Vars
    - B(c);P_SPINB(c)::B(D)
  - Refutation
    - K(b);S_FLIGHT
Actual
- B(C);
- Vars
  - K(b);OGATEB,P-FLIGHT,XB(C)::R1(B)
  - K(b);S_FLIGHT::B(D)
  - B(c);SBLOCK,XB(C)::B(D)
  - P(d);SBLOCK::QAR1(E),XB(c)
  - B(c);OGATE,SBLOCK::QAB1(E)
  - B(c);N_GUARD::QAR2(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).