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Problem Display

PID: 200376 (8/8/2p5/q1P5/P2Q1B1b/3P4/2p1p3/2K1knRN w - - 0 1)

de Jong, Leonard Nicholaas

Op de Hoogte, 1918

8/8/2p5/q1P5/P2Q1B1b/3P4/2p1p3/2K1knRN

#2

8 + 7

SOLUTION

SOUND
Sets
- 1...Qd2+
  - 2.Bxd2#
- 1...Qc3
  - 2.Qxc3#
- 1...Qb4
  - 2.Qxb4#
- 1...Qb6
  - 2.Bd2#
  - 2.Qc3#
- 1...Qc7
  - 2.Bd2#
  - 2.Qc3#
  - 2.Qb4#
- 1...Qd8
  - 2.Bd2#
  - 2.Qc3#
  - 2.Qb4#
- 1...Qxa4
  - 2.Bd2#
  - 2.Qc3#
- 1...Qb5
  - 2.Bd2#
  - 2.Qc3#
- 1...Qxc5
  - 2.Bd2#
- 1...Qa6
  - 2.Bd2#
  - 2.Qc3#
  - 2.Qb4#
- 1...Qa7
  - 2.Bd2#
  - 2.Qc3#
  - 2.Qb4#
- 1...Qa8
  - 2.Bd2#
  - 2.Qc3#
  - 2.Qb4#
- 1...Bf2
  - 2.Qxf2#
- 1...Bg3
  - 2.Bxg3#
- 1...Bg5
  - 2.Qf2#
- 1...Bf6
  - 2.Bg3#
  - 2.Qf2#
- 1...Be7
  - 2.Bg3#
  - 2.Qf2#
- 1...Bd8
  - 2.Bg3#
  - 2.Qf2#
Tries
- 1.Qa1?
  - threat
    - 2.Kxc2#
  - 1...Qd2+
    - 2.Bxd2#
  - 1...Qxa4
    - 2.Bd2#
    - 2.Qc3#
  - 1...Qxc5
    - 2.Bd2#
  - 1...Qc3
    - 2.Qxc3#
  - 1...Qb6
    - 2.Bd2#
    - 2.Qc3#
  - 1...Qb5
    - 2.Bd2#
    - 2.Qc3#
  - 1...Bf6
    - 2.Bg3#
  - 1...Qb4!
Keys
- 1.Qd8!
  - threat
    - 2.Qxh4#
    - 2.Qxa5#
  - 1...Qd2+
    - 2.Bxd2#
  - 1...Qxd8
    - 2.Bd2#
  - 1...Qxa4
    - 2.Bd2#
    - 2.Qxh4#
  - 1...Qxc5
    - 2.Bd2#
  - 1...Bxd8
    - 2.Bg3#
  - 1...Bf2
    - 2.Qxa5#
  - 1...Qc3
    - 2.Qxh4#
  - 1...Qb4
    - 2.Qxh4#
  - 1...Qb6
    - 2.Bd2#
    - 2.Qxh4#
  - 1...Qc7
    - 2.Bd2#
    - 2.Qxh4#
  - 1...Qb5
    - 2.Bd2#
    - 2.Qxh4#
  - 1...Qa6
    - 2.Bd2#
    - 2.Qxh4#
  - 1...Qa7
    - 2.Bd2#
    - 2.Qxh4#
  - 1...Qa8
    - 2.Bd2#
    - 2.Qxh4#
  - 1...Bg3
    - 2.Bxg3#
    - 2.Qxa5#
  - 1...Bg5
    - 2.Qxa5#
  - 1...Bf6
    - 2.Bg3#
  - 1...Be7
    - 2.Bg3#
    - 2.Qxa5#

FEATURES

Static
- TYPE = BLOCK_THREAT
- CHANGED MATES = 4
- ADDED MATES = 3
- REMOVED MATES = 1
Sets
- Q(f);CHECK,N_GUARD::B(G),XQ(f)
- Q(f);N_GUARD::QAB(F),XQ(f)
- Q(f);N_GUARD,XP(H)::B(G)
- B(e);N_GUARD::QAB1(F),XB(e)
- B(e);N_GUARD::B(G),XB(e)
- B(e);N_GUARD,P_PINB(G)::QAB1(F)
Tries
- Try
  - Q(F);
  - Threat
    - QAR(F)+K(A),XP(c)
  - Vars
    - Q(f);CHECK,N_GUARD::B(G),XQ(f)
    - Q(f);N_GUARD,XP(H)::B(G)
    - Q(f);N_GUARD::QAB(F),XQ(f)
    - B(e);N_GUARD::B(G)
  - Refutation
    - Q(f);
Actual
- Q(F);
- Threat
  - DUALS(2)
- Vars
  - Q(f);CHECK,N_GUARD::B(G),XQ(f)
  - Q(f);N_GUARD,XQ(F)::B(G)
  - Q(f);N_GUARD,XP(H)::B(G)
  - B(e);N_GUARD,XQ(F)::B(G)
  - B(e);::QAB(F),XQ(f)
  - Q(f);::QAB(F),XB(e)
  - B(e);P_PINB(G)::QAB(F),XQ(f)
  - B(e);N_GUARD::B(G)

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).