Virtual Strategy Board

Virtual Strategy Board Notes

Generic notes in no particular order

If you drag a rock to an out-of-play position, such as touching a side line, it stays there, for teaching and illustration. If you strike a rock and the struck rock moves out-of-play, the rock is deleted.

There is no keyboard interface, mouse or touch screen only.

It will run on a touch screen device, such as a tablet or phone, but the phone is so small that it's difficult to drag rocks to where you want them. On my (older) phone it's a bit slow. Your mileage may vary.

There is no double tap, it just does the same function twice

There are defaults that may be interesting, and are located at the top of the code, in the first twenty lines.

If you change the default number of rocks from eight to six (of each color), the reset button just re-loads the same doubles look. There's no way to go back to a regular eight rock game without editing the default again. I recommend that you leave it at eight.

If you want a rock out of the way, it can be parked on the far right edge.

WCF Doubles rules changed in September of 2026
USA Curling has recommended the adoption of the new doubles markers, four instead of three, but left the original version as an acceptable alternative for club play. Verson_3.0 shows three places to pre-positon the stone. Version_4.0 shows the update for four places to pre-position the stone.

The doubles button just adds the necessary rocks and forces the doubles markers to be "on", even if you've turned them off in the defaults section. It does pre-positon two rocks.

Clicking the doubles button again serves as a "toggle" between the regular doubles stone positioning and the power play stone positioning.

The taggle (far right) says "Move" or "Push". The move option lets the struck rock move about three feet. The "Push" option has the struck rock being pushed around. It's easier to position rocks that are touching each other for demonstrations.

I use Notepad++ as my editor of choice. Each tab is set to four characters, so your editor may display wider indents.

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History

Version_1.0 Written in June, 2013 by Howard Griffin - Potomac Curling Club

Version_1.2 Updated October 2016 to add mixed doubles "power play" points

Version_1.3 Updated October 2021 to be able to turn on/off mixed doubles markers

Version_2.0 Written in the summer of 2025, a total rewrite to remove reference to kineticjs, to implement collison detection, to remove rocks once they are bumped to an "out-of-play" position, and finally to add an easy to use "mixed doubles" toggle.

Version_3.0 Updated in February 2026, to change the way rocks behave when struck

Version_4.0 Updated in October 2026 to reflect the WCF change to mixed doubles. The number of pre-positioned stone positions was increased from three to four.

Other uses? It seems as if an older version of my page or code has had a snapshot taken, and embedded in a youTube video. I am delighted that somebody found another good use for it! You can see it in action Understanding Mixed Doubles Curling Starting at 1:01 into the video, and again at 2:29.

Version_1.0	Written in June, 2013 by Howard Griffin - Potomac Curling Club
Version_1.2	Updated October 2016 to add mixed doubles "power play" points
Version_1.3	Updated October 2021 to be able to turn on/off mixed doubles markers
Version_2.0	Written in the summer of 2025, a total rewrite to remove reference to kineticjs, to implement collison detection, to remove rocks once they are bumped to an "out-of-play" position, and finally to add an easy to use "mixed doubles" toggle.
Version_3.0	Updated in February 2026, to change the way rocks behave when struck
Version_4.0	Updated in October 2026 to reflect the WCF change to mixed doubles. The number of pre-positioned stone positions was increased from three to four.