Elliott Wave Rules and Guidelines: Alternation, Extension and Equality

Lesson 2 of 8 · Beginner

Rule or guideline? The difference that saves your count

Elliott has two kinds of statement. Rules are conditions which, if violated, mean the count is discarded; there are no exceptions and nothing to negotiate. Guidelines are tendencies seen in most cases but that may not be respected. Many beginners swap the two: they either bend a rule with a little "flexibility", or take a guideline so seriously that they discard a perfectly valid count.

The right logic is this: first apply the rules as a filter to eliminate impossible counts, then use the guidelines to rank the counts that remain. A count that obeys every rule but breaks several guidelines is possible, but less probable.

The three hard rules of an impulse

1. Wave 2 never retraces more than 100% of wave 1. In an uptrend, the low of wave 2 must not go below the start of wave 1. If it does, what you called wave 1 was probably part of a correction.
2. Wave 3 is never the shortest of waves 1, 3 and 5. The comparison is made on price length. Wave 3 need not be the longest; it just cannot be the shortest.
3. Wave 4 does not enter the price territory of wave 1. In an uptrend, the low of wave 4 must not go below the high of wave 1. The well-known exception is the diagonal, where overlap between waves 4 and 1 is part of the definition.

Educational example on XAUUSD: if wave 1 runs from 4,000 to 4,050, the low of wave 2 must not go below 4,000, and after wave 3 finishes, the low of wave 4 must not fall below 4,050. Now suppose wave 3 runs from 4,020 to 4,095, which is 75 dollars. Because wave 1 was only 50 dollars, wave 3 cannot be the shortest in any case. But if wave 1 had been, say, 90 dollars, the second rule would effectively cap wave 5: wave 5 could not be longer than 75 dollars, or the count would have to change.

A data note: the rules are measured on actual highs and lows. The feeds of different CFD brokers and COMEX gold futures (GC) differ slightly at the extremes, so treat a count that passes a rule by only a few cents as a fragile count.

The alternation guideline

The idea of alternation is that the market usually does not repeat the same behaviour in the same form twice in a row. Its best-known use is on waves 2 and 4: if wave 2 was a sharp, deep correction (for example a zigzag), wave 4 is more likely to be a shallow, sideways correction (a flat, triangle or combination), and vice versa.

Alternation is not only about shape; it also shows in depth, duration and complexity. For example, wave 2 might retrace 61.8% of wave 1 in two days, while wave 4 retraces only 23.6% to 38.2% of wave 3 over a week. So if wave 2 was sharp, prepare for a long, grinding wave 4.

The extension guideline and the truncated fifth

In most impulses one of waves 1, 3 or 5 is noticeably longer than the others and has clearer sub-waves; this is called the "extended" wave. In stocks, extension is most often seen in wave 3. In commodities, including gold, many analysts report that an extended wave 5 is relatively more common, because emotional, fast-moving final phases occur often in these markets.

A practical use: if waves 1 and 3 were roughly the same size, wave 5 is more likely to extend. If wave 3 was extended, wave 5 is usually simpler and shorter.

The opposite case is the truncated fifth (a failed fifth): wave 5, despite having five complete sub-waves, fails to move beyond the end of wave 3. It is most often seen after a very strong wave 3 and warns that the trend's strength has run out. To use this label you must see the internal five-wave structure; otherwise "truncated fifth" becomes an excuse for rescuing a wrong count.

Equality, channelling and a few more guidelines

• Equality: when wave 3 is extended, waves 1 and 5 tend to be roughly equal in price (and sometimes time), or to have a ratio near 0.618 to each other.
• Channelling: draw a line from the end of wave 2 to the end of wave 4 and a parallel through the end of wave 3. Wave 5 often ends around the upper line; a sharp move through it (a throw-over) is sometimes seen in excited fifth waves.
• Depth of wave 4: wave 4 often ends within the territory of the fourth wave of one smaller degree inside wave 3.
• Diagonals: an ending diagonal usually has three-wave sub-waves (3-3-3-3-3), while a leading diagonal can be 5-3-5-3-5 or 3-3-3-3-3. After an ending diagonal there is usually a sharp retracement toward its starting point.
• Wave personality: a wave's appearance should fit its position; a wave 3 that is slow and heavily overlapping looks more like a correction than the body of a trend.

A checklist for validating a count

1. Check the three rules against exact highs and lows.
2. Look at the internal structure of waves 1, 3 and 5 on a smaller timeframe.
3. Assess the alternation of waves 2 and 4.
4. Identify which wave is extended or likely to extend.
5. Draw the 2-4 channel.
6. Write the invalidation level for the primary count and the alternate count.

The goal of this checklist is not to guarantee a "correct" count; it is to eliminate weak counts and to make the point where you change your mind explicit.

📊 See real gold futures volume behind these ideas: free order flow course · today's gold volume map

Frequently asked questions

What if the wave 4 rule is violated by only a few cents?

In classical Elliott, a violation means that count is invalidated, however small it is. It is better to examine an alternative count, such as a diagonal or a corrective structure, and to allow for differences between data feeds.

Is wave 3 always the longest wave?

No. The rule says only that wave 3 is not the shortest. In gold, wave 5 is sometimes the longest.

How reliable is alternation?

Alternation is a guideline, not a rule. It is useful for ranking scenarios, but a valid count should not be discarded just because alternation was not respected.

Education only, not a recommendation to buy or sell; we never give signals. Price examples are illustrative. Test any method on a demo account first, with strict risk management.