Course Ratingâ¢ Primer
The RCGA Course Rating Systemâ¢ is the standard upon which the RCGA Handicap Systemâ¢ is built. It affects all golfers in the calculation of a Handicap IndexÂ®. Players “play to their handicaps,” when their net scores (gross scoreâhandicap strokes) equal the RCGA Course Ratingâ¢.
The RCGA Course Rating System takes into account the factors that affect the playing difficulty of a golf course.
Course rating teams from authorized golf associations carry out the on-course portion of the rating process. Authorized golf associations review the work of the teams and then issue ratings.
Accuracy and consistency are the keys to effective course rating. A course must first be accurately measured. The measured yardage must then be corrected for the effective playing length. These effective playing length corrections are roll, elevation, dogleg/forced lay-up, prevailing wind, and altitude. Obstacles that affect playing difficulty must then be evaluated in accordance with established standards. These standards increase objectivity in course rating.
A female scratch golfer is a player who can play to a Course Handicap of zero on any and all rated golf courses. A female scratch golfer, for rating purposes, can hit tee shots an average of 210 yards and can reach a 400-yard hole in two shots at sea level.
RCGACourse Rating: An RCGA Course Rating is the evaluation of the playing difficulty of a course for scratch golfers under normal course and weather conditions. It is expressed as the number of strokes taken to one decimal place (72.5), and is based on yardage and other obstacles to the extent that they affect the scoring difficulty of the scratch golfer.
Bogey Golfer: A male bogey golfer is a player who has a Course Handicapâ¢ of approximately 20 on a course of standard difficulty. He can hit tee shots an average of 200 yards and can reach a 370-yard hole in two shots at sea level.
A female bogey golfer is a player who has a Course Handicap of approximately 24 on a course of standard difficulty. She can hit tee shots an average of 150 yards and can reach a 280-yard hole in two shots at sea level.
Bogey Ratingâ¢: A Bogey Rating is the evaluation of the playing difficulty of a course for bogey golfers under normal course and weather conditions. It is expressed as the number of strokes taken to one decimal place (92.1), and is based on yardage and other obstacles to the extent that they affect the scoring difficulty of the bogey golfer.
Slope RatingÂ®: A Slope Rating is the RCGAÂ® mark that indicates the measurement of the relative playing difficulty of a course for players who are not scratch golfers, compared to scratch golfers. It is computed from the difference between the Bogey Rating and the RCGA Course Rating times a constant factor and is expressed as a whole number from 55 to 155.
The Rating Process
The rating process requires a study of each hole, including detailed data obtained at all landing zones for both the scratch and the bogey golfer. The rating teams use the average shot lengths for both scratch and bogey golfers to determine the landing zones. Length corrections and obstacle values are considered at each landing zone.
Effective Playing Length Factors
Roll: Roll is an evaluation of how far the tee shots for scratch and bogey golfers roll, and the effect that has on the playing length of the course.
Elevation: Elevation is a measure of how changes in elevation from tee to green affect the playing length of a hole.
Dogleg/ Forced Lay-Up: Dogleg/forced lay-up is a measure of how much longer or shorter a hole is played because it has a bend (allowing players to cut the corner or forcing them to lay up), or because it has obstacles, such as water or deep bunkers, crossing the fairway in the playersâ landing zones (which force the scratch or bogey golfer to hit less than a full shot).
Prevailing Wind: Prevailing wind is a measure of the effect of constant wind on seaside courses, plains courses, or other courses unprotected from the wind.
Altitude: Altitude is an evaluation for courses at 2,000 feet or more altitude that will play shorter than their measured length because shots fly farther in the thin air.
Topography: Topography is a factor if the stance or lie in the landing zone is affected by slopes or mounds, or the shot to the green is uphill or downhill, making club selection more difficult.
Out of Bounds/ExtremeRough: OB/Extreme Rough is the evaluation of the distance from the center of the landing zone to the OB/Extreme Rough. High grass, heavy underbrush in trees, and other extreme conditions are rated in this category because a ball in such “extreme rough” is likely to be lost or virtually unplayable. Such areas may also be rated under Recoverability and Rough.
Water Hazards: Water Hazards is the evaluation of a water hazard and its distance from the landing zone or green and, in the case of a hazard crossing a hole, the problem involved in playing over the hazard. The Water Hazards rating is applied on any hole where there is a water hazard or lateral water hazard.
Each obstacle is assigned a value of 0 to 10, depending on its relation to how a scratch or bogey golfer would play the hole. When the evaluation is complete, the numbers for each holeâs obstacles are totaled and multiplied by a relative weighting factor. The weighted obstacle stroke values are applied to scratch and bogey formulas and then converted to strokes. Those strokes are added or subtracted from the Yardage Rating to produce a Bogey Rating and RCGA Course Rating.
Courses must be re-rated at least every 10 years, or if it is a new golf course, every 3 years for the first 10 years. A course must also be re-rated if significant changes have been made to the course. To schedule a course rating, the club representative needs to contact the PEI Golf Association.
The Superintendent, A Most Important Person
1. CHANGE IN EFFECTIVE PLAYING LENGTH – A change of 22 (18) yards in the playing length of the golf course will result in a change of 0.1 strokes in the RCGA Course Rating. A change of 93 (85) yards will change the Slope Rating 1 point.
A) Tee placement – The most obvious way to increase or decrease the effective playing length of the golf course is to move all the tee markers behind or ahead of the permanent yardage markers on each hole. EXAMPLE: Placing the tee markers 10 yards ahead of the permanent markers on each of the 18 holes decreases the overall length of the course 180 yards, which results in the Course Rating being 0.8(1.0) strokes too high and the Slope Rating being 2 points too high.
B) Roll – Softening fairways increases the effective playing length while hardening them decreases the effective playing length. If over-night watering results in the condition of the fairways changing from average to soft, the RCGA Course Rating will be increased 0.2(0.3) strokes. To a greater extent, if the increased watering results in the condition of the fairways changing from firm to average, the RCGA Course Rating will increase 0.5(0.6) strokes and the Slope Rating will increase 1 point.
2. CHANGES IN OBSTACLES – In general, changes in obstacles has less effect on RCGA Course and Slope Ratings than changing the effective playing length of the golf course. Increasing or decreasing an obstacle rating by only 1 point will result in the RCGA Course Rating being adjusted only 11 one-thousandths of a stroke. In order for the RCGA Course Rating to change 0.1 strokes you must have a change of 9 points in the obstacle ratings.
Listed below are the obstacles that are directly affected by maintenance practices and how they can change the RCGA Course and Slope Ratings.
A) Rough and Recoverability – Changing the rough height by 1 inch on all 18 holes adjusts the RCGA Course Rating 0.7 strokes and the Slope Rating 5 points.
B) Green Target – Changing the holding properties of the greens by over or under watering the course will adjust the RCGA Course Rating 0.2 strokes and the Slope Rating 1 point.
C) Green Surface – Changing the Stimpmeter speed on all 18 greens by 1 to 1Â½ feet will raise/lower the RCGA Course Rating 0.2 strokes and the RCGA Slope Rating 1 point.
A change in other obstacles that we evaluate can also effect the RCGA Course Rating and Slope Ratings, but the items listed above are items that are directly attributable to the maintenance staff. Based upon the items listed above, the following chart will show how the slightest change in maintenance practices can effect the accuracy of the RCGA Course and Slope Ratings.
OBSTACLE/EFF.LENGTH CHANGED CHANGE IN RCGA C/R CHANGE IN SLOPE RATING
ROUGH HEIGHT + or – 0.7 + or – 5
GREEN TARGET + or – 0.2 + or – 1
GREEN SURFACE + or – 0.2 + or – 1
TEE PLACEMENT + or – 0.8 + or – 2
ROLL + or – 0.5 + or – 1
TOTAL CHANGE + or – 2.4 + or – 10
IT IS IMPERATIVE THAT COURSE SET-UP AND MAINTENANCE REMAIN CONSISTENT IN ORDER TO MAINTAIN THE CONDITIONS UNDER WHICH THE COURSE WAS LAST RATED
The purpose of the RCGA Course Rating System is to measure and rate the relative difficulty of golf courses across Canada so that a player’s Handicap Factor is accurate and transportable from golf course to golf course.
Course Rating information from RCGA: http://www.rcga.org/english/Handicapping/course.asp