diff --git a/api-webapp/src/main/kotlin/org/jeudego/pairgoth/ext/OpenGotha.kt b/api-webapp/src/main/kotlin/org/jeudego/pairgoth/ext/OpenGotha.kt
index 3b6f180..bf597d1 100644
--- a/api-webapp/src/main/kotlin/org/jeudego/pairgoth/ext/OpenGotha.kt
+++ b/api-webapp/src/main/kotlin/org/jeudego/pairgoth/ext/OpenGotha.kt
@@ -50,6 +50,20 @@ object OpenGotha {
         val placmtParams = ogTournament.tournamentParameterSet.placementParameterSet
         val pairParams = ogTournament.tournamentParameterSet.pairingParameterSet
 
+        // some checks
+
+        if (genParams.genNBW2ValueAbsent.toDouble() != 0.0) {
+            throw Error("Pairgoth only support 0 for 'NBW for Absent player'")
+        }
+
+        if (genParams.genNBW2ValueBye.toDouble() != 2.0) {
+            throw Error("Pairgoth only support 1 for 'NBW for Bye player'")
+        }
+
+        if (genParams.genMMS2ValueBye.toDouble() != 2.0) {
+            throw Error("Pairgoth only support 1 for 'MMS for Bye player'")
+        }
+
         val pairgothPairingParams = PairingParams(
             base = BaseCritParams(
                 nx1 = pairParams.paiStandardNX1Factor.toDouble(),
@@ -71,10 +85,7 @@ object OpenGotha {
                 seedSystem2 = parseSeedSystem(pairParams.paiMaSeedSystem2 ?: "SPLITANDSLIP"),
                 additionalPlacementCritSystem1 = Criterion.valueOf(pairParams.paiMaAdditionalPlacementCritSystem1.uppercase()),
                 additionalPlacementCritSystem2 = Criterion.valueOf(pairParams.paiMaAdditionalPlacementCritSystem2.uppercase().replace("NULL", "NONE")),
-                nbwValueAbsent = genParams.genNBW2ValueAbsent.toDouble() / 2.0,
-                nbwValueBye = genParams.genNBW2ValueBye.toDouble() / 2.0,
-                mmsValueAbsent = genParams.genMMS2ValueAbsent.toDouble() / 2.0,
-                mmsValueBye = genParams.genMMS2ValueBye.toDouble() / 2.0,
+                mmsValueAbsent = genParams.genMMS2ValueAbsent.toDouble() / 2.0
             ),
             secondary = SecondaryCritParams(
                 barThresholdActive = pairParams.paiSeBarThresholdActive.toBoolean(),
@@ -293,13 +304,7 @@ object OpenGotha {
                 ).uppercase(Locale.ROOT)
             }" genMMS2ValueAbsent="${
             (tournament.pairing.pairingParams.main.mmsValueAbsent * 2).roundToInt()
-            }" genMMS2ValueBye="${
-            (tournament.pairing.pairingParams.main.mmsValueBye * 2).roundToInt()
-            }" genMMZero="30K" genNBW2ValueAbsent="${
-            (tournament.pairing.pairingParams.main.nbwValueAbsent * 2).roundToInt()
-            }" genNBW2ValueBye="${
-            (tournament.pairing.pairingParams.main.nbwValueBye * 2).roundToInt()
-            }" genRoundDownNBWMMS="true" komi="${tournament.komi}" location="${tournament.location}" name="${tournament.name}" nbMovesCanTime="${tournament.timeSystem.stones}" numberOfCategories="1" numberOfRounds="${tournament.rounds}" shortName="${tournament.shortName}" size="${tournament.gobanSize}" stdByoYomiTime="${tournament.timeSystem.byoyomi}"/>
+            }" genMMS2ValueBye="2" genMMZero="30K" genNBW2ValueAbsent="0" genNBW2ValueBye="2" genRoundDownNBWMMS="true" komi="${tournament.komi}" location="${tournament.location}" name="${tournament.name}" nbMovesCanTime="${tournament.timeSystem.stones}" numberOfCategories="1" numberOfRounds="${tournament.rounds}" shortName="${tournament.shortName}" size="${tournament.gobanSize}" stdByoYomiTime="${tournament.timeSystem.byoyomi}"/>
             <HandicapParameterSet hdBasedOnMMS="${tournament.pairing.pairingParams.handicap.useMMS}" hdCeiling="${tournament.pairing.pairingParams.handicap.ceiling}" hdCorrection="${tournament.pairing.pairingParams.handicap.correction}" hdNoHdRankThreshold="${displayRank(tournament.pairing.pairingParams.handicap.rankThreshold)}"/>
             <PlacementParameterSet>
             <PlacementCriteria>
diff --git a/api-webapp/src/main/kotlin/org/jeudego/pairgoth/model/Pairing.kt b/api-webapp/src/main/kotlin/org/jeudego/pairgoth/model/Pairing.kt
index 786f960..e0a2f13 100644
--- a/api-webapp/src/main/kotlin/org/jeudego/pairgoth/model/Pairing.kt
+++ b/api-webapp/src/main/kotlin/org/jeudego/pairgoth/model/Pairing.kt
@@ -50,10 +50,7 @@ data class MainCritParams(
     val seedSystem2: SeedMethod = SeedMethod.SPLIT_AND_FOLD,
     val additionalPlacementCritSystem1: Criterion = Criterion.RATING,
     val additionalPlacementCritSystem2: Criterion = Criterion.NONE,
-    val nbwValueAbsent: Double = 0.0,
-    val nbwValueBye: Double = 1.0,
     val mmsValueAbsent: Double = 0.5,
-    val mmsValueBye: Double = 1.0
 ) {
     enum class DrawUpDown { TOP, MIDDLE, BOTTOM }
     enum class SeedMethod { SPLIT_AND_FOLD, SPLIT_AND_RANDOM, SPLIT_AND_SLIP }
@@ -245,10 +242,7 @@ fun MainCritParams.Companion.fromJson(json: Json.Object, localDefault: MainCritP
     seedSystem2 = json.getString("secondSeed")?.let { MainCritParams.SeedMethod.valueOf(it) } ?: localDefault?.seedSystem2 ?: default.seedSystem2,
     additionalPlacementCritSystem1 = json.getString("firstSeedAddCrit")?.let { Criterion.valueOf(it) } ?: localDefault?.additionalPlacementCritSystem1 ?: default.additionalPlacementCritSystem1,
     additionalPlacementCritSystem2 = json.getString("secondSeedAddCrit")?.let { Criterion.valueOf(it) } ?: localDefault?.additionalPlacementCritSystem2 ?: default.additionalPlacementCritSystem2,
-    nbwValueAbsent = json.getDouble("nbwValueAbsent") ?: localDefault?.nbwValueAbsent ?: default.nbwValueAbsent,
-    nbwValueBye = json.getDouble("nbwValueBye") ?: localDefault?.nbwValueBye ?: default.nbwValueBye,
-    mmsValueAbsent = json.getDouble("mmsValueAbsent") ?: localDefault?.mmsValueAbsent ?: default.mmsValueAbsent,
-    mmsValueBye = json.getDouble("mmsValueBye") ?: localDefault?.mmsValueBye ?: default.mmsValueBye
+    mmsValueAbsent = json.getDouble("mmsValueAbsent") ?: localDefault?.mmsValueAbsent ?: default.mmsValueAbsent
     )
 
 fun MainCritParams.toJson() = Json.Object(
@@ -263,7 +257,8 @@ fun MainCritParams.toJson() = Json.Object(
     "firstSeed" to seedSystem1,
     "secondSeed" to seedSystem2,
     "firstSeedAddCrit" to additionalPlacementCritSystem1,
-    "secondSeedAddCrit" to additionalPlacementCritSystem2
+    "secondSeedAddCrit" to additionalPlacementCritSystem2,
+    "mmsValueAbsent" to mmsValueAbsent
 )
 
 fun SecondaryCritParams.Companion.fromJson(json: Json.Object, localDefault: SecondaryCritParams? = null) = SecondaryCritParams(
diff --git a/view-webapp/src/main/webapp/tour-parameters.inc.html b/view-webapp/src/main/webapp/tour-parameters.inc.html
new file mode 100644
index 0000000..e69de29