diff --git a/DbTictactoe.pro b/DbTictactoe.pro
new file mode 100644
index 0000000..ae43575
--- /dev/null
+++ b/DbTictactoe.pro
@@ -0,0 +1,20 @@
+QT += core
+QT -= gui widgets
+
+DBLIBS +=
+
+TARGET = tictactoe
+
+PROJECT_ROOT = ..
+
+SOURCES += main.cpp
+
+HEADERS +=
+
+FORMS +=
+
+RESOURCES +=
+
+TRANSLATIONS +=
+
+include($${PROJECT_ROOT}/app.pri)
diff --git a/main.cpp b/main.cpp
new file mode 100644
index 0000000..595b089
--- /dev/null
+++ b/main.cpp
@@ -0,0 +1,241 @@
+#include <QCoreApplication>
+#include <QDir>
+#include <QFile>
+#include <QTextStream>
+#include <QDebug>
+
+enum class FieldType { EMPTY, CIRCLE, CROSS };
+
+char fieldTypeLetter(const FieldType fieldType)
+{
+    switch(fieldType)
+    {
+    case FieldType::EMPTY: return '_';
+    case FieldType::CIRCLE: return 'O';
+    case FieldType::CROSS: return 'X';
+    default: qFatal("unexpected field type");
+    }
+}
+
+template<std::size_t WIDTH, std::size_t HEIGHT>
+QString getFieldName(const std::array<std::array<FieldType, WIDTH>, HEIGHT> &field)
+{
+    QString result;
+
+    for(int y = 0; y < HEIGHT; y++)
+    {
+        const auto &row = field.at(y);
+
+        if(!result.isEmpty())
+            result.append('-');
+
+        for(int x = 0; x < WIDTH; x++)
+            result.append(fieldTypeLetter(row.at(x)));
+    }
+
+    return result;
+}
+
+template<std::size_t WIDTH, std::size_t HEIGHT>
+quint64 getFieldHash(const std::array<std::array<FieldType, WIDTH>, HEIGHT> &field)
+{
+    quint64 result = 0;
+    quint64 digitValue = 1;
+
+    for(quint32 y = 0; y < HEIGHT; y++)
+        for(quint32 x = 0; x < WIDTH; x++)
+        {
+            quint8 digit = (quint8)field.at(y).at(x);
+
+            result += digit * digitValue;
+
+            digitValue *= 3;
+        }
+
+    return result;
+}
+
+template<std::size_t SIZE>
+FieldType getFieldWinner(const std::array<std::array<FieldType, SIZE>, SIZE> &field)
+{
+    for(quint32 y = 0; y < SIZE; y++)
+    {
+        const auto &row = field.at(y);
+        auto last = row.at(0);
+
+        if(last != FieldType::EMPTY)
+        {
+            auto failed = false;
+            for(quint32 x = 1; x < SIZE; x++)
+            {
+                if(row.at(x) != last)
+                {
+                    failed = true;
+                    break;
+                }
+                last = row.at(x);
+            }
+
+            if(!failed)
+                return last;
+        }
+    }
+
+    for(quint32 x = 0; x < SIZE; x++)
+    {
+        auto last = field.at(0).at(SIZE-1);
+
+        if(last != FieldType::EMPTY)
+        {
+            auto failed = false;
+            for(quint32 y = 1; y < SIZE; y++)
+            {
+                if(field.at(y).at(x) != last)
+                {
+                    failed = true;
+                    break;
+                }
+                last = field.at(y).at(x);
+            }
+
+            if(!failed)
+                return last;
+        }
+    }
+
+    {
+        auto last = field.at(0).at(0);
+
+        if(last != FieldType::EMPTY)
+        {
+            auto failed = false;
+            for(quint32 i = 1; i < SIZE; i++)
+            {
+                if(field.at(i).at(i) != last)
+                {
+                    failed = true;
+                    break;
+                }
+                last = field.at(i).at(i);
+            }
+
+            if(!failed)
+                return last;
+        }
+    }
+
+    {
+        auto last = field.at(0).at(SIZE-1);
+
+        if(last != FieldType::EMPTY)
+        {
+            auto failed = false;
+            for(quint32 i = 1; i < SIZE; i++)
+            {
+                if(field.at(i).at(SIZE - i) != last)
+                {
+                    failed = true;
+                    break;
+                }
+                last = field.at(i).at(SIZE - i);
+            }
+
+            if(!failed)
+                return last;
+        }
+    }
+
+    return FieldType::EMPTY;
+}
+
+template<std::size_t WIDTH, std::size_t HEIGHT>
+QString writeField(const QDir &dir, const std::array<std::array<FieldType, WIDTH>, HEIGHT> &field)
+{
+    const auto fieldHash = getFieldHash(field);
+    const auto name = (fieldHash == 0 ? QStringLiteral("index") : QString::number(fieldHash)) + ".html";
+
+    qDebug() << "writing" << name;
+
+    QFile file(dir.absoluteFilePath(name));
+
+    if(file.exists())
+        return name;
+
+    auto winner = getFieldWinner(field);
+
+    const auto fieldPlayer = std::count(std::begin(field.at(0)), std::end(field.at(2)), FieldType::CIRCLE) <
+                             std::count(std::begin(field.at(0)), std::end(field.at(2)), FieldType::CROSS) ?
+                             FieldType::CIRCLE : FieldType::CROSS;
+
+    if(!file.open(QIODevice::WriteOnly | QIODevice::Truncate | QIODevice::Text))
+        qFatal("Could not open file");
+
+    QTextStream textStream(&file);
+    textStream << "<table border=\"1\">" << endl;
+
+    for(quint32 y = 0; y < HEIGHT; y++)
+    {
+        const auto &row = field.at(y);
+
+        textStream << "<tr>" << endl;
+
+        for(quint32 x = 0; x < WIDTH; x++)
+        {
+            textStream << "<td>";
+
+            if(row.at(x) == FieldType::EMPTY && winner == FieldType::EMPTY)
+            {
+                auto copy = field;
+                copy[y][x] = fieldPlayer;
+                const auto otherName = writeField(dir, copy);
+                textStream << "<a href=\"" << otherName << "\">_</a>";
+            }
+            else
+                textStream << fieldTypeLetter(row.at(x));
+
+            textStream << "</td>" << endl;
+        }
+
+        textStream << "</tr>" << endl;
+    }
+
+    textStream << "</table>" << endl;
+
+    switch(winner)
+    {
+    case FieldType::CIRCLE:
+        textStream << "<span style=\"font-size: 2em;\">CIRCLE won</span>" << endl;
+        break;
+    case FieldType::CROSS:
+        textStream << "<span style=\"font-size: 2em;\">CROSS won</span>" << endl;
+        break;
+    default:
+        switch(fieldPlayer)
+        {
+        case FieldType::CIRCLE:
+            textStream << "<span style=\"font-size: 2em;\">CIRCLE plays</span>" << endl;
+            break;
+        case FieldType::CROSS:
+            textStream << "<span style=\"font-size: 2em;\">CROSS plays</span>" << endl;
+            break;
+        default:
+            qt_noop();
+        }
+    }
+
+    return name;
+}
+
+int main(int argc, char *argv[])
+{
+    QCoreApplication a(argc, argv);
+
+    QDir dir("tictactoe");
+    dir.removeRecursively();
+    dir.mkpath(dir.absolutePath());
+
+    std::array<std::array<FieldType, 3>, 3> test {};
+    writeField(dir, test);
+
+    return 0;
+}