| 1B1B — introductory alpine routes | The entry step of the cited scale. A route may mix paths, scree and straightforward rock or snow; the combination is line-specific. A low number does not remove glacier or altitude hazards. | Sure-footed movement, navigation, monitoring the party and understanding the full descent. Snow, glacier travel or belayed sections require the relevant trained skills. | Footwear for the terrain, insulation, weather protection, headlamp and navigation. Helmet and technical equipment depend on the actual line; they are not ruled out by the grade. |
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| 2A2A — initial technical objectives | Individual sections may require more than walking: a rock ridge, snow, ice or transitions between them. | Basic rope-team work, belaying and organised descent on the terrain actually encountered. Being beside an experienced person does not replace training. | Helmet, harness, rope and belay equipment as required by the description; compatible crampons and axe for snow/ice variants. Select rock and ice protection separately. |
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| 2B2B — consolidating technical experience | A step above 2A in overall difficulty. Obstacles may be more sustained, require more assured protection or be harder to combine into a complete itinerary. | Consistent teamwork, anchor and descent competence, reading the topo and assessing retreat. Practise on the relevant rock or snow/ice terrain. | A complete line-specific rack including protection and descent equipment. A glaciated approach calls for a trained rope team and rescue equipment regardless of the rock grade. |
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| 3A3A — an established technical rope team | A middle step in this scale, with technical sections forming a substantial part of the objective. The number does not prescribe one fixed rock or ice character. | Coordinated movement through multiple sections, changing protection methods, time management and assisting a partner. Be able to complete the descent if conditions deteriorate. | Rope system, protection for the surfaces encountered, helmet and equipment for an unplanned delay. Choose ice tools for the actual ice rather than the grade number alone. |
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| 3B3B — sustained multipitch competence | A more demanding overall combination than 3A. Difficulty may come from sustained technical work and its interaction with the setting, not a single move. | Independent, coordinated teamwork, sound anchor judgement and planning a complex descent. Experience must fit the route surface, not merely indoor climbing ability. | Topo-specific technical equipment with provision for descent and delay. If a bivouac may be needed, plan cold protection; fixed ropes or equipped anchors are not assumed. |
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| 4A4A — a difficult alpine objective | A high technical step requiring both section-level ability and the capacity to complete the whole line. Snow, ice, rock and mixed ground present very different problems. | Confident leading and protection on the relevant terrain, efficient transitions and a workable retreat plan. Decisions must account for the whole team’s remaining capacity. | Protection and ropes for the exact line, emergency-descent equipment, communications and weather reserves. Ice-face and rock-route racks are not interchangeable. |
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| 4B4B — sustained difficult climbing | A step above 4A overall. Individually moderate moves can still form a serious objective through their length and combination. | Mature team tactics: maintain efficient progress without degrading protection, manage reserves and preserve retreat options. Experience on comparable mountain lines matters. | A carefully selected technical rack plus descent and self-sufficiency equipment. Check protection, water and bivouac assumptions against the topo and recent information. |
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| 5A5A — an advanced mountain objective | A high overall difficulty that may describe a demanding altitude expedition or a technical face. The number alone does not identify the determining factor. | Extensive experience of comparable terrain and scale, independent judgement and a rescue plan. Altitude routes additionally require acclimatisation and camp management. | Route-type equipment: altitude protection and camps, wall equipment, or a combination. A 5A label alone cannot define the packing list. |
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| 5B5B — high team consistency | The next overall step above 5A. A strong team must manage the complete line rather than only its most visible crux. | Practised leadership and teamwork, managing a complex descent and limited reserves. Expertise in one discipline does not replace experience of the rest of the route. | Specialist protection, ropes and retreat equipment selected for the real line. Bivouac and altitude systems are assessed separately from the free-climbing grade. |
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| 6A6A — expert level | One of the two highest steps in the cited scale. Technical obstacles, scale and effort are considered together; it is not a synonym for French 6a. | Expert competence on the relevant terrain with substantial technical and tactical reserves. Independent planning and a realistic complex-retreat capability are essential. | An individually planned expedition or wall system and emergency provision. The grade cannot yield a sufficient equipment list without the full route description. |
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| 6B6B — the highest step of the scale | The highest of the eleven steps in the cited 2021 FAR rules. It concerns a particular classified line, not the whole mountain or a neighbouring variant. | A team with established experience of comparable objectives, complete route understanding and its own contingency decisions. The number is not a certificate of readiness. | A fully individual terrain-, tactic- and commitment-specific system including descent and possible evacuation. The grade alone does not prescribe aid climbing or a fixed rope count. |
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