diff --git a/processor/logic/terrain.cpp b/processor/logic/terrain.cpp
new file mode 100644
index 0000000..3fa15ad
--- /dev/null
+++ b/processor/logic/terrain.cpp
@@ -0,0 +1,194 @@
+#include "terrain.h"
+#include <random>
+#include <assert.h>
+#include <functional>
+
+using namespace std;
+
+BadImportTerrainConfig::BadImportTerrainConfig(size_t pt):pt(pt){}
+
+const char* BadImportTerrainConfig::what() const noexcept{
+    return ("ImportTerrainConfig "+to_string(pt)).c_str();
+}
+
+const char* BadCapitalAssign::what() const noexcept{
+    return "Bad Capital Assign";
+}
+
+inline namespace{
+    mt19937 rnd(19260817);
+    enum class VertexType:std::uint8_t{
+        Ordinary,Mountain,Capital,Cut
+    };
+    bool ban(VertexType t){return t==VertexType::Mountain||t==VertexType::Capital;}
+    template<typename T> void upmin(T &x,const T &y){if(y<x)x=y;}
+    pair<bool,vector<Point>> generateCapital(pos_t w,pos_t h,vector<vector<VertexType>> &vertex_type,int r){
+        auto findCut=[&](){
+            int idx=0; vector<vector<int>> dfn(h,vector<int>(w)),low=dfn;
+            function<void(int,int,int,int,bool)> tarjan=[&](int x,int y,int fx,int fy,bool rt){
+                dfn[x][y]=low[x][y]=++idx;
+                int ch=0;
+                for(int i=0;i<4;i++){
+                    static const int dx[]={0,0,-1,1},dy[]={-1,1,0,0};
+                    const int xx=x+dx[i],yy=y+dy[i];
+                    if(xx<0||xx>=h||yy<0||yy>=w) continue;
+                    if(vertex_type[xx][yy]==VertexType::Capital) vertex_type[x][y]=VertexType::Cut;
+                    if(ban(vertex_type[xx][yy])||(xx==fx&&yy==fy)) continue;
+                    if(!dfn[xx][yy]){
+                        ch++;
+                        tarjan(xx,yy,x,y,0);
+                        upmin(low[x][y],low[xx][yy]);
+                        if(!rt&&low[xx][yy]>=dfn[x][y]) vertex_type[x][y]=VertexType::Cut;
+                    }
+                    else upmin(low[x][y],dfn[xx][yy]);
+                }
+                if(rt&&ch>=2) vertex_type[x][y]=VertexType::Cut;
+            };
+            bool flag=0;
+            for(pos_t i=0;i<h;i++){
+                for(pos_t j=0;j<w;j++){
+                    if(!ban(vertex_type[i][j])&&!dfn[i][j]){
+                        if(flag) return false;
+                        flag=1,tarjan(i,j,-1,-1,1);
+                    }
+                }
+            }
+            return true;
+        };
+        vector<Point> res(r);
+        for(int i=0;i<=r;i++){
+            if(!findCut()) return {false,vector<Point>()};
+            if(i==r) break;
+            vector<Point> options;
+            for(pos_t x=0;x<h;x++){
+                for(pos_t y=0;y<w;y++){
+                    if(vertex_type[x][y]==VertexType::Ordinary) options.emplace_back(x,y);
+                    if(vertex_type[x][y]==VertexType::Cut) vertex_type[x][y]=VertexType::Ordinary;
+                }
+            }
+            if(options.empty()) return {false,vector<Point>()};
+            res[i]=options[rnd()%options.size()];
+            vertex_type[res[i].x][res[i].y]=VertexType::Capital;
+        }
+        return {true,res};
+    }
+}
+
+GameBoard ImportedTerrain::makeGameBoard(const InitInfo &init_info){
+    auto perm=[](std::uint8_t n){
+        vector<std::uint8_t> vec(n);
+        iota(vec.begin(),vec.end(),0);
+        shuffle(vec.begin(),vec.end(),rnd);
+        return vec;
+    };
+    GameBoard g(w,h,init_info);
+    for(pos_t i=0;i<h;i++){
+        for(pos_t j=0;j<w;j++){
+            g.at(i,j).type=tiles[i][j].type;
+            g.at(i,j).unit=tiles[i][j].unit;
+        }
+    }
+    auto arrange=[&perm,&g](const vector<Player> &players,const vector<vector<Point>> &capitals,vector<Player> &rest){
+        vector<Point> caps;
+        for(const auto &v:capitals){
+            for(const auto &p:v) caps.push_back(p);
+            if(caps.size()>=players.size()) break;
+        }
+        auto C=perm(players.size()),D=perm(caps.size());
+        for(size_t j=D.size();j<C.size();j++)
+            rest.push_back(players[C[j]]);
+        for(size_t j=0;j<min(C.size(),D.size());j++){
+            g.at(caps[D[j]].x,caps[D[j]].y).type=TileType::Capital;
+            g.at(caps[D[j]].x,caps[D[j]].y).owner=players[C[j]];
+        }
+    };
+    vector<vector<Player>> players(g.numTeams());
+    for(int i=1,n=g.numPlayers();i<=n;i++)
+        players[g.teamOf(i)-1].push_back(i);
+    auto A=perm(players.size()),B=perm(capitals.size()-1);
+    vector<Player> rest1;
+    for(size_t i=B.size();i<A.size();i++)
+        for(auto id:players[A[i]]) rest1.push_back(id);
+    for(size_t i=0;i<min(A.size(),B.size());i++)
+        arrange(players[A[i]],capitals[B[i]],rest1);
+    vector<Player> rest2;
+    arrange(rest1,capitals.back(),rest2);
+    int T=5;
+    while(T--){
+        vector<vector<VertexType>> vertex_type(h,vector<VertexType>(w,VertexType::Ordinary));
+        for(pos_t i=0;i<h;i++){
+            for(pos_t j=0;j<w;j++){
+                if(g.at(i,j).type==TileType::Mountain) vertex_type[i][j]=VertexType::Mountain;
+                if(g.at(i,j).type==TileType::Capital) vertex_type[i][j]=VertexType::Capital;
+            }
+        }
+        auto pr=generateCapital(w,h,vertex_type,rest2.size());
+        if(!pr.first) continue;
+        for(size_t i=0;i<rest2.size();i++){
+            g.at(pr.second[i].x,pr.second[i].y).type=TileType::Capital;
+            g.at(pr.second[i].x,pr.second[i].y).owner=rest2[i];
+        }
+        return g;
+    }
+    throw BadCapitalAssign();
+}
+
+ImportedTerrain importTerrain(const ImportTerrainConfig &in){
+    ImportedTerrain t;
+    t.w=in.w,t.h=in.h;
+    t.tiles.resize(t.h,vector<ImportedTerrain::TerrainTile>(t.w));
+    size_t pt=0;
+    auto error=[&](){throw BadImportTerrainConfig(pt);};
+    auto view=[&](char c){return pt<in.value.size()&&in.value[pt]==c?(pt++,true):false;};
+    auto jump=[&](char c){if(!view(c)) error();};
+    auto read=[&](int l=-99999,int r=99999){
+        bool neg=view('-');
+        if(!(pt<in.value.size()&&isdigit(in.value[pt]))) error();
+        std::int32_t x=0;
+        while(pt<in.value.size()&&isdigit(in.value[pt])){
+            x=x*10+(in.value[pt]^'0');
+            if(x>99999) error(); pt++;
+        }
+        if(neg) x=-x;
+        if(x<l||x>r) error();
+        return x;
+    };
+    static vector<Point> vec[27][101];
+    for(pos_t i=0;i<t.h;i++){
+        for(pos_t j=0;j<t.w;j++){
+            auto &p=t.tiles[i][j];
+            if(view(' ')) p.type=TileType::Blank;
+            else if(view('m')) p.type=TileType::Mountain;
+            else if(view('n')){
+                p.type=TileType::Blank;
+                p.unit=read();
+            }
+            else if(view('s')) p.type=TileType::Swamp;
+            else if(view('g')){
+                p.type=TileType::Blank;
+                bool tag=1;
+                int team=(pt<in.value.size()&&isupper(in.value[pt])?in.value[pt++]-'A':(tag=view(' '),26));
+                int priority=(tag&&pt<in.value.size()&&isdigit(in.value[pt])?read(1,99):100);
+                vec[team][priority].emplace_back(i,j);
+            }
+            else{
+                p.type=TileType::Stronghold;
+                p.unit=read();
+            }
+            if(i+1<t.h||j+1<t.w) jump(',');
+        }
+    }
+    if(pt!=in.value.size()) error();
+    t.capitals.emplace_back();
+    for(int i=0;i<=26;i++){
+        for(int j=100;j>=1;j--){
+            if(!vec[i][j].empty()){
+                t.capitals.back().emplace_back().swap(vec[i][j]);
+            }
+        }
+        if(!t.capitals.back().empty()&&i!=26){
+            t.capitals.emplace_back();
+        }
+    }
+    return t;
+}
\ No newline at end of file
diff --git a/processor/logic/terrain.h b/processor/logic/terrain.h
new file mode 100644
index 0000000..85b46b7
--- /dev/null
+++ b/processor/logic/terrain.h
@@ -0,0 +1,42 @@
+#ifndef OGLG_TERRAIN_H_
+#define OGLG_TERRAIN_H_
+
+#include "pc/Point.h"
+#include "pc/pctypes.h"
+#include "pc/commcode.h"
+#include "logic/GameBoard.h"
+#include <vector>
+#include <exception>
+
+class BadImportTerrainConfig:std::exception{
+public:
+    BadImportTerrainConfig(size_t);
+    ~BadImportTerrainConfig()=default;
+    const char* what() const noexcept;
+private:
+    size_t pt;
+};
+
+class BadCapitalAssign:std::exception{
+public:
+    ~BadCapitalAssign()=default;
+    const char* what() const noexcept;
+};
+
+class ImportedTerrain{
+public:
+    friend ImportedTerrain importTerrain(const ImportTerrainConfig &in);
+    GameBoard makeGameBoard(const InitInfo &init_info);
+private:
+    struct TerrainTile{
+        TileType type;
+        std::int32_t unit;
+    };
+    pos_t w,h;
+    std::vector<std::vector<TerrainTile>> tiles;
+    std::vector<std::vector<std::vector<Point>>> capitals;
+};
+
+ImportedTerrain importTerrain(const ImportTerrainConfig &in);
+
+#endif
diff --git a/processor/xmake.lua b/processor/xmake.lua
index 26e3d41..10ece0d 100644
--- a/processor/xmake.lua
+++ b/processor/xmake.lua
@@ -4,7 +4,7 @@ set_version("0.1.0")
 set_languages("c++20")
 set_targetdir("build")
 
-add_includedirs(".", "pc", "utility")
+add_includedirs(".", "pc", "utility", "logic")
 
 add_files("pc/*.cpp", "utility/*.cpp", "logic/*.cpp")
 target("main")