[helene_t]

Both 1♠ and 2♠ are explained as FSF. 1NT denies four spades. So there is no way to bid a weak hand with spades.

This would make sense if GIB played Walsh but it doesn't - opener bids 4-card suits up the line.

[lycier]

I think it involves the design of the system, the problem cannot be solved very well If play up the line as bidding rules.very complicated.

[lycier]

I made a lot of research before.now three hands from Chinese Forum at below.


Hand-1

lycier, on 2013-November-14, 02:25, said:

这是一副我刚刚和机器人打出的牌面：

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这副牌是值得参考的。
我觉得如果我再叫2nt，那机器人很可能pass。那么为什么机器人再叫2D逼局而不自己直接3nt？而北家的牌还需要什么进一步描述的？原因恐怕还是探查落脚点。

As you know,2♦ is a unnecessary bid,should bid up to 3nt.

Hand-2

lycier, on 2013-December-05, 03:09, said:

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这是机器人牌面，仅供参考。

1♠ must imply game force? I don't know.

Hand-3

lycier, on 2014-January-02, 04:59, said:

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这又是一例我和机器人的实战牌例，看看叫牌过程和坐庄经过吧。

bid 1♠? why not 3♠ as splinter?

Above is for reference only