I thought this would be a challenging and informational exercise. I am going to attempt to do a step by step breakdown of Koryo explaining the possible application(s) of each move or sequence of moves. I hope this will lead to lively interaction and Q&A. Any of us who practice the Yudanja Poomsae know it is hard to find concrete explanations on application. My explanations will be general in nature. I feel there is ample knowledge base on the Form to get an informed consensus. So here we go. I will try to do a simple numerical/written description of each move using the Kukkiwon website as reference. Like my own your school/system may have subtle differences in how you do the form. 1. Turn left, open hand middle block. Application - Opening defensive movement. General middle level blocking tool. 2. Step forward and double side kick. Application - The first kick is low like a check, the second kick is a head level attack. 3. Stepping forward after the second side kick, perform a middle knife hand strike. Application - It follows a high kick so it could be clearing any remaining aggressive motion from an attacker. The Kukkiwon example shows it dead level with the shoulder. This could be striking a hand/arm or the neck. 4. Middle punch. Application - The knife hand strike created a mid-section opening. 5. Closed hand inside block. Application - A punch or a roundhouse or other non-linear kick block. 6/7/8. Repeat on the other side. 9. Open hand down block w/left hand. Application - Defensive move for a low attack such as a front kick. 10. Open handed lower jaw strike w/ right hand. Application - Lower jaw strike pulling the head down. 11. Mid level front kick w/ right foot Application - Solar plexus strike with additional intent to drop opponents hands 12. Open hand down block w/right hand Application - Repeat defensive move using other hand for a low attack such as a front kick. 13. Open handed lower jaw strike w/left hand Application - Lower jaw strike pulling the head down 14. Mid level front kick w/left foot Application - Solar plexus strike with additional intent to drop opponents hands 15. Open hand down block w/left hand Application - Defensive move for a low attack such as a front kick. 16. Open handed lower jaw strike w/ right hand. Kihap Application - Lower jaw strike 17. Step forward with left leg turning 180°. Left leg becomes rear leg and perform double outside block Application - Changing direction and creating distance while blocking two middle level attacks from different sides. 18. Middle level front kick with Left leg & step into an open hand knee check/break Application - Offensive Solar Plexus kick or check to stop forward motion immediately followed by a strike/check to the attackers knee. 19. Slight shift back to Right leg front stance into double outside spreading blocks. Emphasis on spreading the blocked components. Application - Breaking the opponents base and creating an opening. 20. Pick up Right leg and step back into back stance & with Left arm perform one handed open hand outside block. Application - General middle level blocking tool. The attack is coming from your back side and the block stops the attack, leaving the attackers body open. 21. Horse stance Target punch Application - The hand is used to represent the attackers near side rib cage where the middle punch is striking. 22. Step in front with the Right foot crossing stance and perform a Left leg side kick. Application - Covering distance to get in the best position for the kick. 23. After the kick, Change directions 180° landing in a left leg back front stance, groin strike and simultaneously block the neck. Application - Multiple attackers; After the kick, turn to confront the second attacker who is very close. They are attacking high which is the purpose of the neck block, leaving the groin open for a strike. 24. Step slightly back into a neutral position; left leg to the rear front stance and down block. Application - On guard position after attack. 25. Step forward into a front stance pressing block. Application - Strong block for a low kick shifting the attackers leg and body to your front side. 26. Step forward into a horse stance and perform a reinforced elbow strike. Application - The attackers side is open so the elbow is to the temple or ribcage. 27 thru 32. Repeat the same sequence on the other side. 33. Turn facing the beginning form line. Feet come together into ready stance and hands come together with a target down block with the left hand. Application - Turning to change direction, settling to face next attacker. 34. Step forward with left leg and open hand (palm down) outside strike followed be an open hand down block. Application - Strike and block combination. 35. Step forward with right leg and open hand (palm up) inside strike to the neck followed by an open hand down block. Application - Strike and block combination. 36. Step forward with left leg and open hand (palm up) inside strike to the neck followed by an open hand down block. Application - Strike and block combination. 37. Step forward with right foot and strike the philtrum. Kihap. Application - Finishing strike with emphasis.