code: function(col,row){
  		if(col===(void 0)||isNaN(col)){ col=this.cols; row=this.rows;}
  
  		this.allclear(false); // initGroupで、新Objectに対しては別途allclearが呼ばれます
  
  		this.initGroup('cell',   col, row);
  		this.initGroup('cross',  col, row);
  		this.initGroup('border', col, row);
  		this.initGroup('excell', col, row);
  
  		this.cols = col;
  		this.rows = row;
  		this.setminmax();
  		this.setposAll();
  
  		this.initExtraObject(col,row);
  
  		this.rebuildInfo();
  
  		this.puzzle.cursor.initCursor();
  		this.puzzle.opemgr.allerase();
  	}
docs: --------------------------------------------------------------------------- bd.initBoardSize() 指定されたサイズで盤面の初期化を行う ---------------------------------------------------------------------------