diff --git a/pkg/game/command.go b/pkg/game/command.go
index b42b679..91a7b73 100644
--- a/pkg/game/command.go
+++ b/pkg/game/command.go
@@ -3,29 +3,21 @@ package game
 import "github.com/iliadenisov/galaxy/pkg/model/game"
 
 func DeclareWar(configure func(*Param), from, to string) (err error) {
-	control(configure, func(c *ctrl) { c.execute(func(r Repo) { err = updateRelation(r, from, to, game.RelationWar) }) })
+	control(configure, func(c *ctrl) {
+		c.execute(func(r Repo, g game.Game) { err = updateRelation(r, g, from, to, game.RelationWar) })
+	})
 	return
 }
 
 func DeclarePeace(configure func(*Param), from, to string) (err error) {
-	control(configure, func(c *ctrl) { c.execute(func(r Repo) { err = updateRelation(r, from, to, game.RelationPeace) }) })
+	control(configure, func(c *ctrl) {
+		c.execute(func(r Repo, g game.Game) { err = updateRelation(r, g, from, to, game.RelationPeace) })
+	})
 	return
 }
 
-func updateRelation(r Repo, hostRace, opponentRace string, rel game.Relation) error {
-	g, err := r.LoadState()
-	if err != nil {
-		return err
-	}
-	hostID, err := g.HostRaceID(hostRace)
-	if err != nil {
-		return err
-	}
-	opponentID, err := g.OpponentRaceID(opponentRace)
-	if err != nil {
-		return err
-	}
-	if err := g.UpdateRelation(hostID, opponentID, rel); err != nil {
+func updateRelation(r Repo, g game.Game, hostRace, opponentRace string, rel game.Relation) error {
+	if err := g.UpdateRelation(hostRace, opponentRace, rel); err != nil {
 		return err
 	}
 	return r.SaveState(g)
diff --git a/pkg/game/command_test.go b/pkg/game/command_test.go
index 819056c..bccfe8d 100644
--- a/pkg/game/command_test.go
+++ b/pkg/game/command_test.go
@@ -1,26 +1,70 @@
 package game_test
 
 import (
-	"fmt"
 	"testing"
 
 	"github.com/iliadenisov/galaxy/pkg/game"
-	"github.com/iliadenisov/galaxy/pkg/util"
+	mg "github.com/iliadenisov/galaxy/pkg/model/game"
 	"github.com/stretchr/testify/assert"
 )
 
-func TestRelation(t *testing.T) {
-	root, cleanup := util.CreateWorkDir(t)
-	defer cleanup()
-	players := 20
-	races := make([]string, players)
-	for i := range players {
-		races[i] = fmt.Sprintf("race_%02d", i)
-	}
-	_, err := game.ComposeGame(func(p *game.Param) { p.StoragePath = root }, races)
-	assert.NoError(t, err)
+func TestDeclarePeaceAndWarSingle(t *testing.T) {
+	g(t, func(f func(*game.Param), g func() mg.Game) {
+		hostRace := "race_05"
+		opponentRace := "race_01"
 
-	err = game.DeclarePeace(func(p *game.Param) { p.StoragePath = root }, "race_05", "race_01")
-	assert.NoError(t, err)
-	// TODO: check relation state changed
+		r, err := g().Relation(hostRace, opponentRace)
+		assert.NoError(t, err)
+		assert.Equal(t, mg.RelationWar, r.Relation)
+
+		assert.NoError(t, game.DeclarePeace(f, hostRace, opponentRace))
+		r, err = g().Relation(hostRace, opponentRace)
+		assert.NoError(t, err)
+		assert.Equal(t, mg.RelationPeace, r.Relation)
+
+		assert.NoError(t, game.DeclareWar(f, hostRace, opponentRace))
+		r, err = g().Relation(hostRace, opponentRace)
+		assert.NoError(t, err)
+		assert.Equal(t, mg.RelationWar, r.Relation)
+	})
+}
+
+func TestDeclarePeaceAndWarAll(t *testing.T) {
+	g(t, func(f func(*game.Param), g func() mg.Game) {
+		hostRace := "race_07"
+
+		for i := range testRaceCount {
+			opponentRace := raceNum(i)
+			if opponentRace == hostRace {
+				continue
+			}
+			r, err := g().Relation(hostRace, opponentRace)
+			assert.NoError(t, err)
+			assert.Equal(t, mg.RelationWar, r.Relation)
+		}
+
+		assert.NoError(t, game.DeclarePeace(f, hostRace, hostRace))
+
+		for i := range testRaceCount {
+			opponentRace := raceNum(i)
+			if opponentRace == hostRace {
+				continue
+			}
+			r, err := g().Relation(hostRace, opponentRace)
+			assert.NoError(t, err)
+			assert.Equal(t, mg.RelationPeace, r.Relation)
+		}
+
+		assert.NoError(t, game.DeclareWar(f, hostRace, hostRace))
+
+		for i := range testRaceCount {
+			opponentRace := raceNum(i)
+			if opponentRace == hostRace {
+				continue
+			}
+			r, err := g().Relation(hostRace, opponentRace)
+			assert.NoError(t, err)
+			assert.Equal(t, mg.RelationWar, r.Relation)
+		}
+	})
 }
diff --git a/pkg/game/controller.go b/pkg/game/controller.go
index 60bbe21..d56dfcd 100644
--- a/pkg/game/controller.go
+++ b/pkg/game/controller.go
@@ -4,6 +4,7 @@ import (
 	"fmt"
 
 	"github.com/google/uuid"
+	"github.com/iliadenisov/galaxy/pkg/model/game"
 	"github.com/iliadenisov/galaxy/pkg/repo"
 )
 
@@ -16,8 +17,13 @@ type Param struct {
 	StoragePath string
 }
 
-func ComposeGame(configure func(*Param), races []string) (gameID uuid.UUID, err error) {
-	control(configure, func(c *ctrl) { c.execute(func(r Repo) { gameID, err = newGame(r, races) }) })
+func LoadState(configure func(*Param)) (g game.Game, err error) {
+	control(configure, func(c *ctrl) { c.executeInit(func(r Repo) { g, err = c.repo.LoadState() }) })
+	return
+}
+
+func GenerateGame(configure func(*Param), races []string) (gameID uuid.UUID, err error) {
+	control(configure, func(c *ctrl) { c.executeInit(func(r Repo) { gameID, err = newGame(r, races) }) })
 	return
 }
 
@@ -47,10 +53,22 @@ func control(configure func(*Param), consumer func(*ctrl)) error {
 	return nil
 }
 
-func (c *ctrl) execute(consumer func(Repo)) error {
+func (c *ctrl) executeInit(consumer func(Repo)) error {
 	if err := c.repo.Lock(); err != nil {
 		return fmt.Errorf("execute: lock failed: %s", err)
 	}
 	consumer(c.repo)
 	return c.repo.Release()
 }
+
+func (c *ctrl) execute(consumer func(Repo, game.Game)) error {
+	if err := c.repo.Lock(); err != nil {
+		return fmt.Errorf("execute: lock failed: %s", err)
+	}
+	g, err := c.repo.LoadState()
+	if err != nil {
+		return err
+	}
+	consumer(c.repo, g)
+	return c.repo.Release()
+}
diff --git a/pkg/game/controller_test.go b/pkg/game/controller_test.go
index f865ebf..26b1339 100644
--- a/pkg/game/controller_test.go
+++ b/pkg/game/controller_test.go
@@ -5,21 +5,47 @@ import (
 	"testing"
 
 	"github.com/iliadenisov/galaxy/pkg/game"
+	mg "github.com/iliadenisov/galaxy/pkg/model/game"
 	"github.com/iliadenisov/galaxy/pkg/util"
 	"github.com/stretchr/testify/assert"
 )
 
+const (
+	testRaceCount = 20
+)
+
+func raceNum(i int) string {
+	return fmt.Sprintf("race_%02d", i)
+}
+
 func TestComposeGame(t *testing.T) {
+	g(t, func(p func(*game.Param), g func() mg.Game) {
+		_, err := game.GenerateGame(p, []string{"r1", "r2"})
+		assert.Error(t, err)
+		assert.ErrorContains(t, err, "state for turn 0 already saved")
+	})
+}
+
+func g(t *testing.T, f func(func(*game.Param), func() mg.Game)) {
 	root, cleanup := util.CreateWorkDir(t)
 	defer cleanup()
-	players := 20
-	races := make([]string, players)
-	for i := range players {
-		races[i] = fmt.Sprintf("race_%02d", i)
+	races := make([]string, testRaceCount)
+	for i := range testRaceCount {
+		races[i] = raceNum(i)
 	}
-	_, err := game.ComposeGame(func(p *game.Param) { p.StoragePath = root }, races)
-	assert.NoError(t, err)
-	_, err = game.ComposeGame(func(p *game.Param) { p.StoragePath = root }, races)
-	assert.Error(t, err)
-	assert.ErrorContains(t, err, "state for turn 0 already saved")
+	p := func(p *game.Param) { p.StoragePath = root }
+	_, err := game.GenerateGame(p, races)
+	if err != nil {
+		assert.FailNow(t, "g: ComposeGame", err)
+		return
+	}
+	g := func() mg.Game {
+		g, err := game.LoadState(p)
+		if err != nil {
+			assert.FailNow(t, "g: LoadState", err)
+			return mg.Game{}
+		}
+		return g
+	}
+	f(p, g)
 }
diff --git a/pkg/model/game/game.go b/pkg/model/game/game.go
index 51c0b35..5bec478 100644
--- a/pkg/model/game/game.go
+++ b/pkg/model/game/game.go
@@ -25,14 +25,14 @@ func (g Game) Votes(raceID uuid.UUID) float64 {
 	return pop / 1000.
 }
 
-func (g Game) HostRaceID(name string) (uuid.UUID, error) {
+func (g Game) hostRaceID(name string) (uuid.UUID, error) {
 	if v, ok := g.raceID(name); ok {
 		return v, nil
 	}
 	return uuid.Nil, e.NewHostRaceUnknownError(name)
 }
 
-func (g Game) OpponentRaceID(name string) (uuid.UUID, error) {
+func (g Game) opponentRaceID(name string) (uuid.UUID, error) {
 	if v, ok := g.raceID(name); ok {
 		return v, nil
 	}
@@ -48,19 +48,67 @@ func (g Game) raceID(raceName string) (uuid.UUID, bool) {
 	return uuid.Nil, false
 }
 
-func (g Game) UpdateRelation(hostID, opponentID uuid.UUID, rel Relation) error {
+func (g Game) UpdateRelation(hostRace, opponentRace string, rel Relation) error {
+	hostID, err := g.hostRaceID(hostRace)
+	if err != nil {
+		return err
+	}
+	var opponentID uuid.UUID
+	if hostRace == opponentRace {
+		opponentID = hostID
+	} else if opponentID, err = g.opponentRaceID(opponentRace); err != nil {
+		return err
+	}
+	return g.updateRelationInternal(hostID, opponentID, rel)
+}
+
+func (g Game) updateRelationInternal(hostID, opponentID uuid.UUID, rel Relation) error {
 	for r := range g.Race {
 		if g.Race[r].ID == hostID {
 			for o := range g.Race[r].Relations {
-				if g.Race[r].Relations[o].RaceID == opponentID {
+				switch {
+				case hostID == opponentID:
+					g.Race[r].Relations[o].Relation = rel
+				case g.Race[r].Relations[o].RaceID == opponentID:
 					g.Race[r].Relations[o].Relation = rel
 					return nil
 				}
 			}
-			return e.NewGameStateError("UpdateRelation: opponent not found")
+			if hostID != opponentID {
+				return e.NewGameStateError("UpdateRelation: opponent not found")
+			}
 		}
 	}
-	return e.NewGameStateError("UpdateRelation: host %v not found", hostID)
+	if hostID != opponentID {
+		return e.NewGameStateError("UpdateRelation: host %v not found", hostID)
+	}
+	return nil
+}
+
+func (g Game) Relation(hostRace, opponentRace string) (RaceRelation, error) {
+	hostID, err := g.hostRaceID(hostRace)
+	if err != nil {
+		return RaceRelation{}, err
+	}
+	opponentID, err := g.opponentRaceID(opponentRace)
+	if err != nil {
+		return RaceRelation{}, err
+	}
+	return g.relationInternal(hostID, opponentID)
+}
+
+func (g Game) relationInternal(hostID, opponentID uuid.UUID) (RaceRelation, error) {
+	for r := range g.Race {
+		if g.Race[r].ID == hostID {
+			for o := range g.Race[r].Relations {
+				if g.Race[r].Relations[o].RaceID == opponentID {
+					return g.Race[r].Relations[o], nil
+				}
+			}
+			return RaceRelation{}, e.NewGameStateError("Relation: opponent not found")
+		}
+	}
+	return RaceRelation{}, e.NewGameStateError("Relation: host %v not found", hostID)
 }
 
 func (g Game) MarshalBinary() (data []byte, err error) {
diff --git a/pkg/model/game/race.go b/pkg/model/game/race.go
index 5067d7d..eed52c6 100644
--- a/pkg/model/game/race.go
+++ b/pkg/model/game/race.go
@@ -25,8 +25,8 @@ type Race struct {
 type Relation string
 
 const (
-	RelationWar   = "War"
-	RelationPeace = "Peace"
+	RelationWar   Relation = "War"
+	RelationPeace Relation = "Peace"
 )
 
 type RaceRelation struct {