Meson Chess Problem Database

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Problem Display

PID: 125417 (7r/8/4Q3/4n1Pk/5P2/7K/8/8 w - - 0 1)

Anonymous

Source?, 0000

7r/8/4Q3/4n1Pk/5P2/7K/8/8

#2

4 + 3

3713	Snap	2009
6490	yacpdb	2009

SOLUTION

SOUND
Sets
- 1...Rh6
  - 2.Qxh6#
- 1...Ra8
  - 2.Qh6#
- 1...Rb8
  - 2.Qh6#
- 1...Rc8
  - 2.Qh6#
- 1...Rd8
  - 2.Qh6#
- 1...Re8
  - 2.Qh6#
- 1...Rf8
  - 2.Qh6#
- 1...Rg8
  - 2.Qh6#
- 1...Sd3
  - 2.Qf7#
- 1...Sf3
  - 2.Qf7#
- 1...Sc4
  - 2.Qf7#
- 1...Sg4
  - 2.Qf7#
- 1...Sc6
  - 2.Qf7#
- 1...Sg6
  - 2.Qg4#
  - 2.Qe2#
- 1...Sd7
  - 2.Qf7#
- 1...Sf7
  - 2.Qxf7#
Tries
- 1.Kg3?
  - 1...Rh6
    - 2.Qxh6#
  - 1...Ra8
    - 2.Qh6#
  - 1...Rb8
    - 2.Qh6#
  - 1...Rc8
    - 2.Qh6#
  - 1...Rd8
    - 2.Qh6#
  - 1...Re8
    - 2.Qh6#
  - 1...Rf8
    - 2.Qh6#
  - 1...Rg8
    - 2.Qh6#
  - 1...Sd3
    - 2.Qf7#
  - 1...Sf3
    - 2.Qf7#
  - 1...Sc4
    - 2.Qf7#
  - 1...Sg4
    - 2.Qf7#
  - 1...Sc6
    - 2.Qf7#
  - 1...Sg6
    - 2.Qg4#
    - 2.Qe2#
  - 1...Sd7
    - 2.Qf7#
  - 1...Sf7
    - 2.Qxf7#
  - 1...Rh7!
- 1.Qe8+?
  - 1...Sg6
    - 2.Qe2#
  - 1...Sf7
    - 2.Qxf7#
  - 1...Rxe8!
Keys
- 1.Qf5!
  - 1...Rh7
    - 2.Qxh7#
  - 1...Rh6
    - 2.g6#
  - 1...Ra8
    - 2.Qh7#
  - 1...Rb8
    - 2.Qh7#
  - 1...Rc8
    - 2.Qh7#
  - 1...Rd8
    - 2.Qh7#
  - 1...Re8
    - 2.Qh7#
  - 1...Rf8
    - 2.Qh7#
  - 1...Rg8
    - 2.Qh7#
  - 1...Sd3
    - 2.Qf7#
  - 1...Sf3
    - 2.Qf7#
  - 1...Sc4
    - 2.Qf7#
  - 1...Sg4
    - 2.Qf7#
  - 1...Sc6
    - 2.Qf7#
  - 1...Sg6
    - 2.Qg4#
  - 1...Sd7
    - 2.Qf7#
  - 1...Sf7
    - 2.Qxf7#

This anticipates 38489(1953)

FEATURES

Static
- TYPE = INCOMPLETE_BLOCK
- CHANGED MATES = 8
- ADDED MATES = 2
- REMOVED MATES = 0
Sets
- R(c);N_GUARD::QAR1(D),XR(c)
- R(c);N_GUARD::QAR1(D)
- S(a);N_GUARD::QAB(D)
- S(a);N_GUARD::QAB(D),XS(a)
Tries
- Try
  - K(A);P-FLIGHT
  - Vars
    - R(c);N_GUARD::QAR1(D),XR(c)
    - R(c);N_GUARD::QAR1(D)
    - R(c);N_GUARD,P_PINP(C)::QAR1(D)
    - S(a);N_GUARD::QAB(D)
    - S(a);N_GUARD::QAB(D),XS(a)
  - Refutation
    - R(c);
- Try
  - Q(D);CHECK
  - Vars
    - S(a);OGATE,P_SPINS(a),SBLOCK::QAB(D)
    - S(a);N_GUARD,P_SPINS(a)::QAB(D),XS(a)
  - Refutation
    - R(c);XQ(D)
Actual
- Q(D);
- Vars
  - R(c);N_GUARD::QAR2(D),XR(c)
  - R(c);SBLOCK::QAR(D)+P(C)
  - R(c);N_GUARD::QAR2(D)
  - S(a);N_GUARD::QAB(D)
  - S(a);N_GUARD,SBLOCK::QAB1(D)
  - S(a);N_GUARD::QAB(D),XS(a)

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