The problem with tele_level with disconnected stairs is you can still teleport into a room full of eg. zephyr hounds. With free first move on level change and connected stairs you can escape and tele_level is a foolproof escape. Without both of those advantages it's instadeath just as surely as normal teleport into a room full of zephyr hounds with low HP.
One possible compramise is to guarantee all stairs (or tele_level invocations) lead into completely empty rooms and never line up with hallways. This guarantees safety for a few turns at least even without connected stairs, and with a guarantee of no visible items or monsters makes early scumming less viable. Late scumming could be made less viable by eliminating vaults or by will_asher's idea for a progressively reduced chance of connected stairs.
On that subject, though, it may be more interesting to try to track the number of level changes than to base simply on depth. Allowing x>100 connected stairs not counting level changes that end in town and allowing increasing stair disconnections thereafter would also penalize early scumming just as much as late scumming, but allow for some level of scumming without losing guaranteed stair connection. The bigger x is the sharper the cutoff between allways connected and allways disconnected stairs can be.
One possible compramise is to guarantee all stairs (or tele_level invocations) lead into completely empty rooms and never line up with hallways. This guarantees safety for a few turns at least even without connected stairs, and with a guarantee of no visible items or monsters makes early scumming less viable. Late scumming could be made less viable by eliminating vaults or by will_asher's idea for a progressively reduced chance of connected stairs.
On that subject, though, it may be more interesting to try to track the number of level changes than to base simply on depth. Allowing x>100 connected stairs not counting level changes that end in town and allowing increasing stair disconnections thereafter would also penalize early scumming just as much as late scumming, but allow for some level of scumming without losing guaranteed stair connection. The bigger x is the sharper the cutoff between allways connected and allways disconnected stairs can be.
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