As Łukasz Sławiński mentions, his main goal was to create a opening lead system that would be as clear as possible for us, meaning those of us trying to defeat the contract. It turns out that there is an important correlation in the context of the readability of the opening lead system. The clearer the signaling system is for us, the proportionately clearer it is for the opponents. Given such a clear correlation, in order to defend as enigmatically as possible, we should stick to a natural opening lead system(sarcasm).
opening lead from the low cards
x - A small card played on the first round. If the first small card is high enough that there is a risk it might cause the loss of a trick, you should lead the second highest.
x - The low card is played the second time. The low card should be as low as possible.
x
x x
x x x
x x x x
x x x x x
x x x x x x
opening lead from low card when having one high card
xx - this configuration indicates an even number of cards.
xx - this configuration indicates an odd number of cards.
H x x
H x x x
H x x x x
H x x x x x
Significance of leading a low card from under an honor:
Low card - active lead - from under an honor or a doubleton for a ruff.
High card - passive lead - from a sequence of low cards (at least three).
opening lead from sequences
H H => AK KQ QJ J10 109
If we lead from a doubleton for a ruff — use the lower card!
H H H => AKQ KQJ QJ10 J109
H H h => AKJ KQ10 QJ9
If we don't want to highlight the lowest honor, for example, if we believe it won’t play a role — then lead with the highest card.
H h h => AKJ KQ10 QJ9
A => AK AKQ
K => KQ AKJ AKQ KQJ
Q => QW KQ10 KQJ QJ10
J => J10 QJ9 QJ10 J109 AQJ
10 => 109x... AJ10 KJ10
9 => 9xx... A109 K109 Q109