diff --git a/assets/lang/cs.json b/assets/lang/cs.json
index c427b1d..cc2b30c 100644
--- a/assets/lang/cs.json
+++ b/assets/lang/cs.json
@@ -240,6 +240,7 @@
             "noER1" : "Je vybrán umožněný doběh (R1), ale to není možné, pokud nastal decessive error.",
             "noER2" : "Je vybrán umožněný doběh (R2), ale to není možné, pokud nastal decessive error.",
             "noER3" : "Je vybrán umožněný doběh (R3), ale to není možné, pokud nastal decessive error.",
+            "noTieER" : "Doběh běžce, který byl umístěn na metu jako TIE, musí být unearned.",
             "missingOAdv" : "Je vybrán další postup na 'FC - Occupied)', ale chybí odpovídající FC situace.",
             "window" : {
                 "title" : "Neplatný vstup",
diff --git a/assets/lang/en.json b/assets/lang/en.json
index 249cf07..7b75f45 100644
--- a/assets/lang/en.json
+++ b/assets/lang/en.json
@@ -240,6 +240,7 @@
             "noER1" : "Earned run is selected (Runner at 1st), \nbut this is not possible with a decisive error.",
             "noER2" : "Earned run is selected (Runner at 2nd), \nbut this is not possible with a decisive error.",
             "noER3" : "Earned run is selected (Runner at 3rd), \nbut this is not possible with a decisive error.",
+            "noTieER" : "If a run is scored with a runner placed as TIE, it must be an unearned run.",
             "missingOAdv" : "Advance after 'FC - Occupied' is selected, \nbut no corresponding FC play was given.",
             "window" : {
                 "title" : "Invalid input",
diff --git a/utils/wbsc-validation.ts b/utils/wbsc-validation.ts
index 463919d..1a50719 100644
--- a/utils/wbsc-validation.ts
+++ b/utils/wbsc-validation.ts
@@ -582,9 +582,18 @@ function checkEarnedRuns (inputs: WBSCInput[]) {
   let errR2 = false
   let errR3 = false
 
+  // only relevant for runners at 1st and 2nd
+  // run marked as team-unearned
+  let r1TU = false
+  let r2TU = false
+  // it was a TIE runner
+  let tieR1 = false
+  let tieR2 = false
+
   inputs.forEach((input) => {
     const err = isError(input, decisiveErrorActions)
     const earned = isEarnedRun(input)
+    const teamUnearned = isTeamUnearnedRun(input)
 
     switch (input.group) {
       case inputB:
@@ -599,6 +608,8 @@ function checkEarnedRuns (inputs: WBSCInput[]) {
         }
         break
       case inputR1:
+        tieR1 = input.tie
+        // falls through
       case inputR1a:
       case inputR1b:
         if (err) {
@@ -607,8 +618,13 @@ function checkEarnedRuns (inputs: WBSCInput[]) {
         if (earned) {
           r1ER = true
         }
+        if (teamUnearned) {
+          r1TU = true
+        }
         break
       case inputR2:
+        tieR2 = input.tie
+        // falls through
       case inputR2a:
         if (err) {
           errR2 = true
@@ -616,6 +632,9 @@ function checkEarnedRuns (inputs: WBSCInput[]) {
         if (earned) {
           r2ER = true
         }
+        if (teamUnearned) {
+          r2TU = true
+        }
         break
       case inputR3:
         if (err) {
@@ -640,6 +659,9 @@ function checkEarnedRuns (inputs: WBSCInput[]) {
   if (r3ER && errR3) {
     validation = attachValidation(validation, useT('editor.validation.noER3'))
   }
+  if ((tieR1 && (r1ER || r1TU)) || (tieR2 && (r2ER || r2TU))) {
+    validation = attachValidation(validation, useT('editor.validation.noTieER'))
+  }
 
   return validation
 }
@@ -683,6 +705,10 @@ function isError (input: WBSCInput, actionList: string[]): boolean {
 function isEarnedRun (input: WBSCInput): boolean {
   return (input?.output?.base === 4 || input?.output?.errorTarget === 4) && input?.output?.run === 'e'
 }
+// helper to decide whether there is a team unearned run in current input
+function isTeamUnearnedRun (input: WBSCInput): boolean {
+  return (input?.output?.base === 4 || input?.output?.errorTarget === 4) && input?.output?.run === 'tu'
+}
 
 // helper to attach new part of validation message to previous contents
 function attachValidation (validation: string, newMessage: string) {