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today —Analysis
That went into your line. The board stays put — here you write what you calculate, instead of playing it out.
assessment
scored
your mark
not scored
promote to
how this works
The board will not move. Write the whole line, both sides, from the position as it stands — then commit. That is the training.
Writing the line
- Play moves on the board to write them. Click a move you have already written to select it, and what you play next depends on whose turn you clicked: the same side starts a bracket — an alternative to that move — and a reply carries the line on from it.
- ⌫ Delete move removes the selected move and everything after it — on the last move, just that move. Backspace does the same.
- ∅ Clear all throws the whole line away and gives you the empty board back.
- ↑ Promote makes a bracket the main line; ↓ Demote sends the main line into a bracket.
- The panel under the line always points at the selected move — and at the position itself before you have written anything, so what you see in the diagram has somewhere to go.
What scores
- Brackets that answer other defences — the moves your opponent might have played instead. Those are the calculation, and each real one you meet and answer is worth +1, up to three, added to what the card is out of as well as to your score. A defence with a single legal answer pays nothing: the point is for the work, not for the writing.
- Assessment is a bet. Get every one right and it pays +1; a single wrong one forfeits the lot.
- Expected is the score your rating predicts on this position. Beat it and the rating climbs.
- Your mark and your note never score. They are yours.
Marks and notes, from the keyboard
- ! and ? cycle the mark on the selected move.
- Any other letter starts a note — the blinking cursor is the invitation, and there is nothing to click. Enter saves it; Enter again commits the line.
- Notes written before you commit are sealed at commit, so they stay a record of what you actually saw rather than what you wish you had.
After you commit
- Clicking a move in your own line steps the board there and puts the cursor in its note. You can post the annotated line to the analysis room.
- Brackets in the printed solution are the branches the position turns on, and they say which is which: not the move most solvers want to play, if … then the move your opponent is most likely to make, and the defence that is as good as the printed one and is met by a different move.
- The board steps on click; the left edge goes back.
Hover anything for its meaning.
or keep going with
this weekmixedwarm-upclubhardbrutaldeep
your verdict
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The analysis room
everyone here committed a line first
rate this position
The training diary
Key to symbols
!very good move!!excellent, rarely found?a mistake — refutation follows in [ ]!?also works?!inexact / a soft defence[ ]YOUR variation — click a written move, enter a different one(not …)on the printed solution: the move most solvers want to play, and why it fails(if … then …)the defence your opponent is most likely to play, and the move that answers it(… is as good: …)a defence as strong as the printed one, met by a different move(… is more resilient: …)a defence as strong as the printed one AND harder to meet — it makes you find more+−/±White wins / is better−+/∓Black wins / is better=even→seeing the whole line through✓≈✗your assessment: right · one band off · wrong1on the printed solution: what that move is worth — a price, not a score✓2points you banked there — the number is how many; hover for why✗1points that were on offer there and went unpaid — hover for why▶played in the game□White to move■Black to move△the threat — what the key move plays next if the defence does nothing!? (muted)YOUR glyph on a move — an opinion, never scored; the grader's mark stays welded to the move itself°a note of yours hangs on this move — solid rule in the column means written while solving, dashed means after the reveal