1. POL555 was on stbd on the starting line after the start.
2. USA170 was leeward, below the line and ahead on stbd and tacked at the pin end to port.
3. USA170 on port collided with USA170.
4. POL555 had no time to take evasive action.
5. USA170 did A penality turn. 
6. No penalty declaration from either boat.
7. POL555 was unable continue racing requiring a replacement boatd due to damage. 
 
USA was required to keep clear of POL555 after tacking to port and collision with serious damage.
USA DSQ. POL555 granted redress redress ave pts of 5 best scores in races 1 through 6 after discard.