Explorer

Your own openings

Explorer puts a board beside your move tree. Play a move, on the board or by clicking its row, and the table shows how often you reached that position, how you scored, and the worst move you played there. The move you play most is in bold. Games in this line and Your notes on this position are beside it.

Above the board, the name of the opening and the Line: every move played so far, from start to the move you stand on. Click any move in it to go back to that position. Under the board, the arrow buttons (or ← and →) step back and forward along the line, Flip turns the board, and Reset goes back to the start.

Above the table, two switches decide which book you are reading. Games from picks your own games, masters or lichess (see below), and Colour counts both of your colours, only the games you had white, or only those you had black.

Beside them, pickers narrow which of your games count. Speed opens a list of the time controls; untick the ones to leave out, and the picker then names the ones left on ("Speed: Blitz, Rapid"). Date is the same date filter as the one over your games: two date fields and the quick picks Today, 7d, 30d, 90d and 1y, each counted back from today. Today is the quick way to look over the openings you just faced. A pick fills the fields with the days it covers, so you can nudge it from there, and a link to "the last 30 days" still means the last 30 days when you open it next month; typed dates stay the dates you typed. Clear, or the × on a picker, counts every game again. Once you have a collection, Collection, under the date, keeps only the games in one of them, so a league season has an opening tree of its own; on All games, a collection's games are in the tree like every other. The tree, its book line and the games below all follow these, and the filter stays in the page's address, so a filtered tree is a link.

When the pane is narrow, the table leaves out its Opening and Note columns; point at a row to read them. Open in Games, beside Games in this line, opens the Games page filtered to this opening, with your colour, a single speed, the dates and the collection carried over.

In the sidebar, Your lines under Explorer lists the openings you reach most, with how you score in each. Click one to see your games in that opening.

The Lichess reference databases

The same board also reads two Lichess databases: masters, over-the-board games between titled players, and the rated lichess pools, narrowable with the Speed picker and the Rating bands. Neither stores anything, and neither is counted in your own numbers. Colour stays in place but greyed out, since only your own games have a colour of yours.

Connect Lichess

Lichess only answers signed-in requests to both reference databases. The first time you open one, it offers Connect Lichess: approve Blunderbase on lichess.org and you come back to the same position with the table filled in. The approval page lists "Read incoming challenges", which is the permission the live import needs; the databases themselves need none. If Lichess later stops accepting the connection, because you revoked it on lichess.org or it expired after a year, the same place offers Reconnect Lichess.

A token pasted in an earlier version keeps working for the databases. To import games live, connect once more on the Import page.

Open a model game

Model games lists games from those databases. One opens in the full game view, with the live engine and Maia working as they do on your own games. What is missing is anything needing a stored row: passes, notes, pinned lines. Add to library stores it as a game you did not play, so it gets the analysis pass and takes notes but counts in no statistic and is not in your opening tree.

Build a repertoire

The repertoire keeps a white and a black tree of your own choosing; the white / black switch beside its name picks which one you see. Play a line on the board and it is saved as you go; a line that is not in the tree yet offers Add this line. Promote to main and Delete branch (click it twice) shape the tree, and each move takes a comment saying why. The board, the Line and the arrow buttons work as they do in the explorer. It is not in the sidebar yet: open /repertoire directly.