Answer to Puzzle #10: Number Game Call Out 50

10. You and I are to play a competitive game. We shall take it in turns to call out integers. The first person to call out '50' wins. The rules are as follows:
–The player who starts must call out an integer between 1 and 10, inclusive;
–A new number called out must exceed the most recent number called by at least one and by no more than 10.

Do you want to go first, and if so, what is your strategy?

Another little puzzle that I worked out for myself, despite that the answer is correct...

Before reading the answer can I interest you in a clue?

smile faces for the number game puzzle

We'll call the players 'W' and 'L' (can you guess which one wins?) The trick is to start at the end and work backwards.
W wins if he says 50, he can say this if...
L says any number in the range 40 - 49 and will have to say one of these if...
W says 39, he can say this if...
L says any number in the range 29 - 38 and will have to say one of these if...
W says 28, he can say this if...
L says any number in the range 18 - 27 and will have to say one of these if...
W says 17, he can say this if...
L says any number in the range 7 - 16 and will have to say one of these if...
W starts on 6.
So that is pretty much it. W wins if he starts on 6 then simply follows the sequence 6, 17, 28, 39, 50. Another way of thinking about this is that W forces each pair of numbers to go up in 11's regardless of what L says, hence he starts on 6 which is 50 - 4x11.





© Nigel Coldwell 2004 -  – The questions on this site may be reproduced without further permission, I do not claim copyright over them. The answers are mine and may not be reproduced without my expressed prior consent. Please enquire using the link at the top of the page.
 


PayPal
I always think it's arrogant to add a donate button, but it has been requested. If I help you get a job though, you could buy me a pint! - nigel

This Website Uses Cookies

Mostly, but not entirely to remember if you have dismissed this very box. Also to increase the functionality of the site. The cookies I apply do not uniquely identify you, by continuing to use this site you agree to let me place a cookie. I also have advert and analytics providers, for more information click here here.x