Windows and Islands — Japanese Gap Analysis

Windows (gaps) in Japanese analysis act as support when rising and resistance when falling. Island reversals, isolated by gaps on both sides, trap participants whose forced exits fuel the reversal. Nison's window rules applied.

What you'll learn

Define a window in Japanese candlestick terminology and explain the difference between a filled and unfilled gap
Describe a rising window and a falling window and explain their continuation implications
Define a gap-and-go and identify what it reveals about directional conviction
Identify an island reversal and explain why isolation by true gaps creates high-conviction signals
Define mat hold and explain how its opening gap distinguishes it from rising three methods
Apply the confirmation, volume, and reliability framework to each window and gap pattern

Time-based and gap patterns

These complete the multi-candle vocabulary by focusing on the role of gaps and price clusters.

Window — The traditional Japanese term for a gap. An upside window is a bullish gap; a downside window is a bearish gap. The term carries an important interpretive idea: a window represents a region of price that traders skipped over, and it tends to act as future support (upside window) or resistance (downside window) when revisited.
Gap filling — When a later candle's range covers the empty space of a prior gap. Filled gaps lose their support or resistance function. Unfilled gaps remain technically significant.
Rising window — An upside gap appearing in an uptrend. Read as a continuation signal. The bottom of the window typically acts as support if price retraces.
Falling window — A downside gap appearing in a downtrend. Continuation signal. The top of the window typically acts as resistance.
Gap and go — A session that opens with a gap and continues moving in the gap's direction throughout the session, closing near the extreme. Indicates strong directional momentum from the open.
Island reversal — A cluster of one or more candles separated from the surrounding price action by gaps on both sides. The candles form an "island" disconnected from the trend before and after. When the second gap closes against the prior trend, it signals a sharp reversal.

Cluster and consolidation terms

Mat hold — A five-candle bullish continuation pattern resembling rising three methods but with a gap. Long bullish candle, then a small bearish candle that gaps above the first, followed by two more small bearish candles drifting down within the range, then a long bullish candle closing at new highs. The gap establishes the pause as constructive rather than corrective.

Window and gap patterns — pattern reference

Pattern	Confirmation	Volume	Reliability	Common Failure Mode
Rising window / falling window	Subsequent sessions respect the gap as support (rising window) or resistance (falling window). Confirmation is structural — the window holds.	Heavy volume on the gap candle confirms the gap is meaningful rather than thin-trading noise.	Generally regarded as among the more reliable continuation signals when the window holds for several sessions. Becomes invalid when filled.	The window fills within a few sessions, especially common with low-volume gaps.
Island reversal	The second gap (against the prior trend) is the confirmation built into the pattern. Further follow-through strengthens.	Heavy volume on both gap candles is ideal.	Generally regarded as a high-conviction reversal signal when it occurs because two gaps on opposite sides of an isolated cluster is statistically uncommon.	The cluster's gaps are partial (shadows overlap) rather than true gaps, so what looks like an island is actually a different pattern.
Mat hold	The fifth candle. Must close beyond the first candle's close.	Same as rising three methods — heavy on the bookend candles, light on the middle.	Generally regarded as a strong continuation signal because the gap adds structural support beyond what rising three methods provides.	Gap fills during the pullback, removing the structural support that distinguishes mat hold from rising three methods.

Rising window: QuantifiedStrategies reports the rising window pattern showed a high efficiency rating in 31.59% of occurrences when tested over a 5-candlestick period in the S&P 500 over a 20-year period. CandleScanner's research found that across 502 S&P 500 symbols over a 20-year date range, the rising window occurred in 5.73% of all candlestick occurrences, with average frequency of 61.1. Teaching point: The CandleScanner frequency statistic is useful for setting student expectations — windows appear roughly once every 60 trading sessions in their data, which is uncommon enough that students shouldn't expect to see them constantly but common enough to encounter regularly across multiple instruments. Falling window: No separate large-sample statistic widely cited; the structural logic and reliability are generally regarded as symmetric to the rising window. Island reversal: The pattern's reliability is primarily described qualitatively across sources — two true gaps on opposite sides of a price cluster is statistically uncommon under normal market conditions, which is the basis for the high-conviction assessment. Misidentification (shadow overlap disqualifying the true gap) is the dominant data-quality issue in any backtest of this pattern. Mat hold: The pattern is rare enough that sample sizes in public backtests are limited. PatternsWizard and thepatternsite.com note the pattern as a strong continuation signal when correctly formed, though frequency rank is low — similar to falling three methods. Multi-source pool (windows and islands): candlescanner.com, quantifiedstrategies.com, trendspider.com, luxalgo.com, synapsetrading.com, thepatternsite.com. Multi-source pool (mat hold): thepatternsite.com, patternswizard.com, therobusttrader.com.

Key Takeaways

A window (gap) represents a price region that was skipped over — it tends to act as future support (rising window) or resistance (falling window) when revisited
Gap filling — when a subsequent candle's range covers the empty space — removes the window's structural function; filled windows should be removed from your support/resistance map
Rising window frequency: CandleScanner found 5.73% of all candlestick occurrences across 502 S&P 500 symbols over 20 years — roughly once every 60 sessions
Island reversals require true gaps on both sides — any shadow overlap converts the pattern to a morning/evening star variant with different reliability
Mat hold resembles rising three methods but with a gap after the first bullish candle; the gap is what makes the pause constructive rather than corrective
The spaces between candles carry information: unfilled gaps are structurally significant; filled gaps are not

Quiz — 3 Questions

Answer one at a time

Question 1 of 30 answered

A rising window formed two weeks ago. Price has since pulled back and closed within the window's range. What does this mean for the window's structural significance?

AThe window has been tested and confirmed — it now acts as stronger support

BThe window has been filled — its support function is no longer structurally valid

CThe window now acts as resistance since price has entered it from above

DThe window remains valid because price needs two consecutive closes inside it to be invalidated

The Interpretation Framework — Location, Magnitude, Confluence, and Confirmation

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