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Problem Display

PID: 68904 (4K3/8/3p1Np1/p2pk1p1/R2b2B1/p3p3/8/1Q6 w - - 0 1)

Gold, Samuel

The Chess Monthly (Hoffer), 1882

4K3/8/3p1Np1/p2pk1p1/R2b2B1/p3p3/8/1Q6

#2

5 + 9

5454	Near Snap	2019

SOLUTION

SOUND
Sets
- 1...Ba1
  - 2.Sd7#
- 1...Bb2
  - 2.Sd7#
- 1...Bc3
  - 2.Sd7#
- 1...Bc5
  - 2.Sd7#
- 1...Bb6
  - 2.Sd7#
- 1...Ba7
  - 2.Sd7#
Tries
- 1.Qd3?
  - threat
    - 2.Qxd4#
  - 1...Kxf6
    - 2.Qxd4#
  - 1...Ba1
    - 2.Sd7#
  - 1...Bb2
    - 2.Sd7#
  - 1...Bc3
    - 2.Sd7#
  - 1...Bc5
    - 2.Sd7#
  - 1...Bb6
    - 2.Sd7#
  - 1...Ba7
    - 2.Sd7#
  - 1...Kf4!
- 1.Qe4+?
  - 1...Kxf6
    - 2.Qxd4#
    - 2.Qe7#
  - 1...dxe4!
- 1.Qa1?
  - threat
    - 2.Qxd4#
  - 1...Kxf6
    - 2.Qxd4#
  - 1...Bxa1
    - 2.Sd7#
  - 1...Bb2
    - 2.Sd7#
  - 1...Bc3
    - 2.Sd7#
  - 1...Kf4!
- 1.Qd1?
  - threat
    - 2.Qxd4#
  - 1...Kxf6
    - 2.Qxd4#
  - 1...Ba1
    - 2.Sd7#
  - 1...Bb2
    - 2.Sd7#
  - 1...Bc3
    - 2.Sd7#
  - 1...Bc5
    - 2.Sd7#
  - 1...Bb6
    - 2.Sd7#
  - 1...Ba7
    - 2.Sd7#
  - 1...Kf4!
- 1.Qb2?
  - threat
    - 2.Qxd4#
  - 1...Kf4
    - 2.Qh2#
  - 1...Kxf6
    - 2.Qxd4#
  - 1...Bxb2
    - 2.Sd7#
  - 1...Bc3
    - 2.Sd7#
  - 1...axb2!
- 1.Qb4?
  - threat
    - 2.Qxd4#
  - 1...Kf4
    - 2.Qxd6#
  - 1...Kxf6
    - 2.Qxd4#
  - 1...Ba1
    - 2.Sd7#
  - 1...Bb2
    - 2.Sd7#
  - 1...Bc3
    - 2.Sd7#
  - 1...Bc5
    - 2.Sd7#
  - 1...Bb6
    - 2.Sd7#
  - 1...Ba7
    - 2.Sd7#
  - 1...axb4!
Keys
- 1.Qb6!
  - threat
    - 2.Qxd4#
  - 1...Kf4
    - 2.Qxd6#
  - 1...Kxf6
    - 2.Qxd4#
  - 1...Bxb6
    - 2.Sd7#
  - 1...Ba1
    - 2.Sd7#
  - 1...Bb2
    - 2.Sd7#
  - 1...Bc3
    - 2.Sd7#
  - 1...Bc5
    - 2.Sd7#

This anticipates 184803(1908)

FEATURES

Static
- TYPE = THREAT
- CHANGED MATES = 0
- ADDED MATES = 2
- REMOVED MATES = 1
Sets
- B(c);::S(D)
Tries
- Try
  - Q(A);
  - Threat
    - QAB1(A),XB(c)
  - Vars
    - K(f);S_FLIGHT,XS(D)::QAB(A),XB(c)
    - B(c);::S(D)
  - Refutation
    - K(f);P_SPINB(c),S_FLIGHT
- Try
  - Q(A);CHECK
  - Refutation
    - P(e);XQ(A)
- Try
  - Q(A);P_PINB(c)
  - Threat
    - QAB1(A),XB(c)
  - Vars
    - K(f);S_FLIGHT,XS(D)::QAB(A),XB(c)
    - B(c);N_SPINB(c),XQ(A)::S(D)
    - B(c);::S(D)
  - Refutation
    - K(f);S_FLIGHT
- Try
  - Q(A);
  - Threat
    - QAB1(A),XB(c)
  - Vars
    - K(f);S_FLIGHT,XS(D)::QAB(A),XB(c)
    - B(c);::S(D)
  - Refutation
    - K(f);P_SPINB(c),S_FLIGHT
- Try
  - Q(A);P_PINB(c)
  - Threat
    - QAB1(A),XB(c)
  - Vars
    - K(f);S_FLIGHT::QAB(A)
    - K(f);S_FLIGHT,XS(D)::QAB(A),XB(c)
    - B(c);N_SPINB(c),XQ(A)::S(D)
    - B(c);::S(D)
  - Refutation
    - P(a);N_SPINB(c),XQ(A)
- Try
  - Q(A);
  - Threat
    - QAB1(A),XB(c)
  - Vars
    - K(f);P_SPINB(c),S_FLIGHT::QAB(A),XP(h)
    - K(f);S_FLIGHT,XS(D)::QAB(A),XB(c)
    - B(c);::S(D)
  - Refutation
    - P(d);XQ(A)
Actual
- Q(A);
- Threat
  - QAB1(A),XB(c)
- Vars
  - K(f);P_SPINB(c),S_FLIGHT::QAB(A),XP(h)
  - K(f);P_SPINP(h),S_FLIGHT,XS(D)::QAB(A),XB(c)
  - B(c);XQ(A)::S(D)
  - B(c);::S(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).