Predicting opponent moves

A simple game, that does not require dice-roll and could be used as a sub-element of any game (and is used in fact in games today - when players compete for a value spending some wealth in secret - "Game Of Thrones")

2-5 (or more) players
Each starts with a predefined number of 'points'.
We go into rounds. Each round player is required to say, how many points will he spend. Person that will choose the highest number of points - wins. If two players are equal - they share the win equally. After determining the winner - points are taken from players and we go with the next round. All finishes, when no-one on board has spare points.

To give an example - three player game, let's name them A, B, C and D. Each has 10 points.

Round 1
A - 1, B - 5, C - 4, D - 10 - winner D (1pt).
R2
A - 1, B - 1, C - 2, D - 0 - winner C(1pt).
R3
A -1, B - 3, C - 4, D - 0 - winner C(1pt).
R4
A - 1, B - 1, C - 0, D - 0 - winner A+B(0.5pt)

And A for 6 games more.

After all
A - 6.5 pt
B - .5 pt
C - 2 pt
D - 1 pt

Just simple as it is. The advantage here also is - it is really, really quick. A bit different topic, but still - a valid one on the blog subject :) How to invent a board game.