# No.1180 (JQ)

 No.1180 James Quah (Singapore) Original Fairy problems JF – 2017(I): January – June

Definition: (click to show/hide)

 No.1180 James Quah Singapore original – 03.01.2017 Solution: (click to show/hide) white kc8 se7g6 qh4 pg4 bf2b1 rb3d6 black ke4 pf4f3c2c6b6 qna4 rc5 bb2 #2                                                 (9+9) Quintessence a4 1.Qh4-g3 ! threat: 2.Qg3*f3 # 1...QNa4-c3 2.Bb1*c2 # { (2. Rd4#? self-check) This is a standard case of the interfering unit (quintessence) preventing the dual mate that would arise by interfering with the bishop.} 1...Rc5-c3 2.Rd6-d4 # { (2. Qxf4+? QNxf4!) This time, although the rook interferes with the quintessence to close the line a4-c3-d5-f4, it opens another line (a4-c5-d3-f4) to give back the same defense.} 1...Bb2-c3 2.Qg3*f4 # { (2. Bxc2+? QNd3!) The bishop interferes with the rook, but opens a line of guard from the quintessence.} 1...f4*g3 2.Rb3-e3 # { (C+ by Popeye 4.75)} Triple Grimshaw with dual avoidance. The quintessence provides all the dual avoidance moves, which are qualitatively distinct. (Author)

### 3 Responses to No.1180 (JQ)

1. Luce Sebastien says:

Quintessence=Knight ZigZag in Winchloe !
A much better name to understand the piece !

2. Geoff Foster says:

Beautiful triple avoidance (a dummy piece on c3 would allow 3 mates). 1…QNc3 pins the wRd6, while the other defences open lines of the bQN.

• Sorry, but in my view this is not triple avoidance, rather cyclical dual avoidance.
E.g. defence 1…Rc3 carries two errors, closing of QN and B lines. One of them is (QN closing) compensated for by opening additional line, i.e. avoided.
The same is true for each thematical move to c3 – two lines are closed, one closing is neutralized by additional dual avoidance effects.
In this case, the triple avoidance would be shown e.g. by three other pieces moving to c3, with all three lines properly closed and each move avoiding two of mates.