Steve Jackson Games - Site Navigation
Home General Info Follow Us Search Illuminator Store Forums What's New Other Games Ogre GURPS Munchkin Our Games: Home

Go Back   Steve Jackson Games Forums > Roleplaying > GURPS

Thread Tools Display Modes
Prev Previous Post   Next Post Next
Old 09-13-2020, 08:31 PM   #9
Doctor of GURPS Ballistics
DouglasCole's Avatar
Join Date: Sep 2004
Location: Burnsville, MN
Default Re: Technical Grappling: Grabbing Parry clarification

Originally Posted by Varyon View Post
The additional roll will often make the chance of success higher, because it puts the additional penalties on the second roll, not the first. Consider a character with skill 12 in a grappling skill, who hasn't trained up Grabbing Parry. With the two-roll version, to grab an arm that's punching at him, he needs to roll against 7 (his Parry is 9, -2 for Grabbing Parry) then 11 (skill 12, -1 to grapple an arm). His chance of pulling it off is (0.162*0.625)=10.125%. With the one-roll version, he needs a single success against 6 (Parry 9, -2 to Grabbing Parry, -1 for arm, as stated in the Technique), which is a 9.25% chance. If he had bought up the Technique to full, the two-roll version would be a roll against 9 then 11 for (0.375*0.625)=23.4%, while the one-roll version would be a single roll against 8, with a 25.92% chance of success. That's slightly higher, but if you work out probabilities for characters with skill above 12 (that is, the majority of characters who are likely to actually try Grabbing Parry), two-roll consistently gives a better result than one-roll. This also has the advantage of matching with the way Aggressive Parry and Jam work.

The roll for attempting to damage the target when using Aggressive Parry/Jam is unopposed, so if we have Grabbing Parry work like that, we don't need to worry about a QC. Indeed, as it stands, if we just add in this extra roll to Grabbing Parry, it behaves almost exactly as one would expect from an Aggressive Parry that replaces the strike with a grapple (the modifiers to hit are halved, as normal for hit locations when grappling, the only difference is that the damage penalty is in the form of using 0.5xST rather than taking a -3 to damage).
All of this is well argued; certainly it has the "use what's there" "Rules for Grappling Rules" down.
Gaming Ballistic, LLC
DouglasCole is online now   Reply With Quote

grabbing parry, grappling, rapid retraction, technical grappling

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Fnords are Off
[IMG] code is Off
HTML code is Off

Forum Jump

All times are GMT -6. The time now is 01:49 AM.

Powered by vBulletin® Version 3.8.9
Copyright ©2000 - 2021, vBulletin Solutions, Inc.