the part I disagree with is that women with high interest will never play games. We know that girls don't know why they do what they do, it just happens.
Some do it unconsciously, some purposefully, but in any regard, when they do have high interest, they're less prone to "play games" because they DON'T want to chance losing you through the cracks. Doc's adage "they help you when they like you" comes into play here.
It's like this: say you have a vested interest in something, for example, you put serious money up on a business venture, or your career literally depends on you making a certain presentation on a deadline. You're not about to try anything that may ruin the chances of its success, unless you're irresponsible.
("Play Games" is also what both genders call it when they don't understand what the opposite sex is doing, even if what they're doing is actually nothing but merely imagined to be something.)
I can give you example after example.
One gal who's number I obtained recently, I just couldn't really find the time to sit down and call her. I was out every night. So, finally, like two weeks after I got her number, I just emailed her and said it'd be better if we just hooked up over a cup of coffee. She could've balked that I didn't call for two weeks, or told me that she's not available, but she didn't verbalize anything like that and agreed to the date... she's interested.
Another one I did meet and just called her recently to invite her out. She was like, "Oh? You didn't seem that interested when we met". Means to me that maybe she was a little confused that I didn't appear enthusiastic, and she could've made it difficult trying to make me jump through hoops or whatever, BUT all the same, she didn't and agreed to a date (actually, declined my offer because of her schedule and then counter-offered. Textbook example of high interest!). It also means to me that she was trying to get a read on me, and if she wasn't interested, she wouldn't care about where she stood with me, it wouldn't be a thought in her head.
Both these women approached me first, BTW, which indicated there was a high enough level of interest on their part up front. They volunteered their numbers, no game playing involved in getting their numbers at all, unlike others, where trying to get their number becomes an ordeal, because they're NOT interested.
So, if a woman exhibits high interest - but then genuinely, intentionally does play games - then either her interest has gone down OR she's got some personality flaws (or issues) that will impede on her interpersonal relationships in a way that the astute gent will understand makes it a red flag for him.