# Strategy: Checkerboard pattern

If obsidian is expensive, and you want the most efficient way to defend your base with it, the chequerboard pattern strategy might be suitable for you.

##### Example design of Obsidian wall.

<table border="1" id="bkmrk-%C2%A0-x-%C2%A0-x-%C2%A0-x-%C2%A0-x-x-%C2%A0-" style="border-collapse: collapse; width: 37.6543%; height: 116px;"><tbody><tr style="height: 29px;"><td class="align-center" style="width: 12.5%; height: 29px;"> </td><td style="width: 12.5%;">**X**</td><td class="align-center" style="width: 12.5%; height: 29px;"> </td><td style="width: 12.5%; height: 29px;">**X**</td><td class="align-center" style="width: 12.5%; height: 29px;"> </td><td style="width: 12.5%; height: 29px;">**X**</td><td class="align-center" style="width: 12.5%; height: 29px;"> </td><td style="width: 12.5%; height: 29px;">**X**</td></tr><tr style="height: 29px;"><td class="align-center" style="width: 12.5%; height: 29px;">**X**</td><td style="width: 12.5%;"> </td><td class="align-center" style="width: 12.5%; height: 29px;">**X**</td><td style="width: 12.5%; height: 29px;"> </td><td class="align-center" style="width: 12.5%; height: 29px;">**X**</td><td style="width: 12.5%; height: 29px;"> </td><td class="align-center" style="width: 12.5%; height: 29px;">**X**</td><td style="width: 12.5%; height: 29px;"> </td></tr><tr style="height: 29px;"><td class="align-center" style="width: 12.5%; height: 29px;"> </td><td style="width: 12.5%;">**X**</td><td class="align-center" style="width: 12.5%; height: 29px;"> </td><td style="width: 12.5%; height: 29px;">**X**</td><td class="align-center" style="width: 12.5%; height: 29px;"> </td><td style="width: 12.5%; height: 29px;">**X**</td><td class="align-center" style="width: 12.5%; height: 29px;"> </td><td style="width: 12.5%; height: 29px;">**X**</td></tr><tr style="height: 29px;"><td class="align-center" style="width: 12.5%; height: 29px;">**X**</td><td style="width: 12.5%;"> </td><td class="align-center" style="width: 12.5%; height: 29px;">**X**</td><td style="width: 12.5%; height: 29px;"> </td><td class="align-center" style="width: 12.5%; height: 29px;">**X**</td><td style="width: 12.5%; height: 29px;"> </td><td class="align-center" style="width: 12.5%; height: 29px;">**X**</td><td style="width: 12.5%; height: 29px;"> </td></tr></tbody></table>

X = obsidian  
Open = Stone brick e.g. or another block.+

##### Example wall:

[![tHcfbri.png](https://wiki.unitedfactions.net/uploads/images/gallery/2021-01/scaled-1680-/thcfbri.png)](https://wiki.unitedfactions.net/uploads/images/gallery/2021-01/thcfbri.png)