• "Heavy Resolve" is not equivalent to the Black Shield. Black Pommel can bypass the Black Shield but not "Heavy Resolve." Therefore, equipping the Black Shield is not recommended as it’s inferior to Yu Jin’s ability.

• "Heavy Resolve" does not apply to black Attacks used during a Duel.

• Yu Jin's defense is very strong against the majority of Attacks, which are typically black-suited. His four units of health also help him survive for extended periods.

• Yu Jin has no offensive capability. His defensive power does not contribute to team strategies or any advanced game tactics.

• Many characters can bypass Yu Jin’s defense, limiting the effectiveness of "Heavy Resolve" in certain matchups.

• Equipping armor makes Yu Jin lose his ability, rendering him a vanilla character when armor is equipped.

• Red-Attack Bypassers:
  Characters like Guan Yu, Zhao Yun, and Xiao Qiao can easily bypass Yu Jin's "Heavy Resolve" by using red Attack cards. Guan Yu's "Fighting Saint" allows him to convert any red card into an Attack, making Yu Jin's immunity to black-suited Attacks useless. Similarly, Zhao Yun's "Dragon Courage" lets him use red Escapes as Attacks, which are not blocked by "Heavy Resolve." Xiao Qiao's "Beauty" turns her spades into hearts, so her spade Attacks become heart Attacks, again bypassing Yu Jin's power.

• Non-Attack Damage Dealers:
  Abilities from characters like Xun Yu, Diao Chan, Zhang Jiao, Fire Zhuge Liang, and Yan Liang and Wen Chou allow them to deal damage through methods other than direct attacks. Zhang Jiao's "Thunderclap" inflicts damage by flipping judgment cards, which makes Yu Jin’s "Heavy Resolve" irrelevant since it only protects against black-suited Attacks.

• Supportive Loyalists:
  When Cao Cao is the king, Yu Jin makes a strong loyalist due to his ability to gather Escapes. Since Yu Jin's immunity to black-suited Attacks makes him harder to damage, he can focus on storing these cards for Cao Cao's benefit. This synergy works especially well because it provides Cao Cao with defensive resources without Yu Jin taking much damage.

King

• • Yu Jin can endure longer games due to his defensive abilities, but his lack of offensive power can make it difficult to eliminate rebels.

Loyalist

• • Yu Jin's value as a loyalist is limited unless Cao Cao is the king, as his defensive nature doesn’t help eliminate rebels. In fact, rebels might focus more on the king if they cannot hit Yu Jin.

Rebel

• • As a rebel, Yu Jin’s defensive nature makes it hard to help in the offensive task of defeating the king. He often finds himself unable to contribute meaningfully to the rebellion's success.

Spy

• • Yu Jin is best suited for the spy role. His defense discourages other characters from attacking him, though his lack of offense makes it difficult to tip the scales in favor of any side.

Yu Jin’s defensive ability with "Heavy Resolve" is often seen as underwhelming because it doesn’t contribute much to a team’s success. His lack of offensive presence and easily bypassed defense by red-suited Attacks makes him a passive character. When using Yu Jin, remember not to equip armor, even if it's Eight Trigrams, as his ability is meant to be superior to any form of armor. Unfortunately, this design choice leaves Yu Jin with very little appeal.

Yu Jin was one of Cao Cao’s most trusted commanders and played a critical role in saving Cao Cao after the Battle of Wan. During the chaotic aftermath of the battle, Cao Cao’s forces were in disarray, and Yu Jin was tasked with rallying the remaining troops. He managed to keep the army together and safely escort Cao Cao to safety. This showed his steadfast nature and loyalty, traits reflected in his ability to defend against a majority of Attacks in the game.

However, despite his loyalty and discipline, Yu Jin's story takes a tragic turn. During the Battle of Fancheng, he surrendered to Guan Yu after heavy flooding trapped his forces. This act of surrender, seen as a stain on his honor, led to his eventual execution by Cao Pi. Yu Jin’s "Heavy Resolve" reflects the strong defensive will he had on the battlefield, but his inability to maintain this under extraordinary pressure mirrors the weaknesses seen in his lack of offense in the game. His strict adherence to his duty and the role he played in stabilizing chaotic situations, as well as his inability to recover from overwhelming conditions, tie directly into the mechanics of his character card in Sanguosha.