CHAOS is invented in 2012, based on the idea of null-opening 1♣.
It is a very memory-efficient and chance-efficient relay system.
It requires very few "true memory" owing to its symmetric and deductive relay structure.
It maximizes the chance that an exact shape relay can be completed by "supplying" points to the (re-)opener during relay.
1♣=15+ waiting null-opening (responses similar to openings below with point range shifted, 1♠ and 1NT swapped)
In 2014, the 2WS is revised to fit the We-Only vulnerability.
The incentive is from that strong clubs are too fragile after interference while Fantunes narrows the space to find major games from a good 2-suiter shape.
This system has no weak preemptive opening.
1-suiters are required to start from 2M or 3m.
2-suiters are highlighted and are shown systematically.
The weak-or-strong 1♣ open reduces the incentive and effect of interference.
The 2-suiter only 1♦ strong open uses penalty doubles to bid own hands and maintains high risk for opponents' preempts.
1♣=12-14 bal/17+ 1-suiter/18+ 3-suiter/18+ bal
1♥=4+♠s 10-13 2-suiter or 14-17 3-suiter
1♠=10-13 2-suiter with 5+♥s or 14-17 3-suiter short ♠