Vera won the alien game on her wrist display. At the real table, her winning move shut the door.
The sand sealing the chamber had been dated: it was older than human chess, older than human writing. Whatever the table had been built to do, she had hoped to be the first person in a very long time to do it.
Six points of light folded into five. A translucent door at the far end of the room darkened without a sound. The stairs behind her remained open.
“Still an exit,” said Ansel over the suit radio. “Let’s preserve the distinction.”
He was outside, keeping the field camp in order. He had already extended her allotted time by twenty minutes. The wind kept getting into his microphone, a papery scraping that reminded her of his terrible habit of eating crackers during meetings.
Vera lifted her finger from the stone. Where she had touched it, a green circle persisted. Across the board, five red lights waited in their new arrangement. Her wrist display had recorded the change.
“That can’t be right,” she said.
“Possibly the universe has failed its examination.”
They had once been married. He knew which jokes she would tolerate at work, and she knew that he told them when worried.
She had found the chamber on their fourth day under the ruined city. Aboveground, the buildings were rings and ribs, roofless against a violet sky. Below, the six lights floated over a table without legs. Beside the table stood two low recesses, each worn smooth in a shallow spiral. One faced the green end of the board, one the red.
She had sent a little camera inside first. No change. When she sat in the green recess, the lights appeared. The camera showed more tables behind the far door, too blurred by its milky surface to make out.
The pattern had seemed familiar: six heaps, a move that joined two points, then a reply that separated others. A game of reduction. She had built a simulation from the first eleven exchanges and found what looked like a forced win. The room beyond the table made an attractive promise. An entire civilization had left its mathematics here. She wanted to be the person who reached it.
Her first paper had been about an inscription nobody else could read. Ansel had helped her carry the equipment through a flooded tunnel, then appeared in its acknowledgments as “field support.” He never mentioned that now. She remembered it whenever he asked her to eat.
She made the next move her simulation advised.
The five red lights became seven.
She checked the recording. No hidden move, no missed flash. It had broken the rule she had given it.
“Come out,” Ansel said. “We can work from the video.”
“Ten minutes.”
“You said ten minutes twenty minutes ago.”
The radio scraped. He was dismantling the camp canopy. The winds on this world followed a regular afternoon cycle; they were unpleasant rather than dangerous inside the shelter, but the exposed gear would have to come in. She was spending another person’s afternoon.
She put both palms against her knees. The lights remained perfectly still.
“I’m coming.”
As she rose, the green circle faded. The red lights did not. She paused halfway up the stair and watched them through her camera.
At camp, Ansel handed her a bag of hot food. He took the empty one from her the moment she finished and pushed a crate toward the shelter door.
“Carry that.”
She did. They stacked batteries, tied down the measuring mast, and folded the canopy together. Sand rattled on its shiny fabric. His left glove had a repaired seam she had watched him mend the night before.
“You think I’m doing it again,” she said.
“Right now I think you should hold your corner higher.”
She lifted it. The last sand ran out.
Inside the shelter, they watched the recordings with the sound off. Vera labeled her moves and the responses. Ansel pulled up the first camera survey.
“The other seat,” he said.
“I checked. No controls.”
He enlarged a frame. The recess at the red end had the same worn spiral as hers, but turned the other way.
“I’m not asking about controls.”
She opened a second window and compared the lights to the seat positions. Every red reply had occurred while the red recess was empty. There was a delay before each response, usually three seconds. Once it had been almost eight.
“Automatic opponent,” she said.
“Or someone on a very long connection.”
“Or a different function altogether.”
“Yes.”
He said it without irritation. That was harder to meet than irritation would have been. She changed the label above her simulation from RULES to GUESSES.
By morning she had three models. In one, the red system cheated. In another, two of the points belonged to a hidden layer. In the third, she had mistaken a response for a move: the red lights were showing her a possible transformation, and she was being asked to supply another.
“I need someone in the second seat,” she said at breakfast.
“For how long?”
“One hour. We leave when your alarm goes, even if something is happening.”
He thought about it while opening his food bag. “You carry the camera.”
The red recess was too narrow for him. He sat sideways, one leg stretched along the floor. Vera settled into the green spiral. The old pattern returned, including the seven lights that had defeated her model.
One red point moved toward Ansel’s glove.
He withdrew his hand. It followed.
“Don’t touch it yet,” she said.
“I wasn’t planning to.”
They waited. After eight seconds the point flickered and went back to its place. Then a small blue ring appeared on the boundary between the green and red halves of the table.
Vera put her hand toward her green circle. A light followed her too. She drew it along the table, slowly, toward the ring. It stopped at a boundary she could feel only as resistance in her glove.
Ansel leaned forward and drew his red point to the ring. Vera brought the green one against it from her side. Inside the blue circle, their lights touched.
The lights opened into an image of the city. The far door slid aside.
It was unmistakable despite the roofs: the outer ring, the tall double rib at the center, the terraces where they had pitched camp. Something moved through its streets in little clusters. The shapes were too small to identify. Above them, a second image appeared, the same city with a different arrangement of shadows.
“Record both,” Vera said.
“Already doing it.”
She reached for the second image. Ansel took his hand away to adjust the camera, and everything collapsed into points again. The far door stayed open. At least one change they had made could outlast their hands.
They looked at each other across the board.
“So both of us,” he said.
Vera tried moving both lights herself. The point on the red side retreated from her. Ansel could draw it back. Whatever the table detected, it distinguished them.
This time she held her light still while he moved his. The city returned. He raised his hand and its sky filled with moving bands. She traced one, and the image slowed. They were able to go backward, then forward, through an entire season. Water filled the ring streets. The little shapes spread out across it. Roofs she had thought decorative were turning with the flow.
Vera laughed so loudly that the suit clipped the sound.
“It’s a model. We were looking at the foundation of a moving—”
“Vera.”
His alarm was sounding.
She could see a new image beginning to form below the first. It held a shape like a coil, rotating through itself. They had six days left on the surface. She wanted the coil, the city, the mechanism beneath the table. She wanted to ask a thousand questions in whatever language her hands had found.
Ansel had started to lift his hand.
“Wait,” she said.
He stopped.
She took hers away first. The city folded down into the lights. One green point and one red remained touching. She waited until they had separated, then stood.
He watched her get the camera.
They went up the stairs. Vera turned, holding the camera halfway up her chest. The far door remained open.
Beyond it were more tables, each with paired recesses, and a broad window through which the violet daylight fell. The nearest table held three points of light in an arrangement she hadn’t seen before.
Ansel sat on the top step to straighten his cramped leg.
“Tomorrow?” she asked.
“After the survey.”
She nodded. She wanted to kiss him, which would have been a different kind of presumption. Instead she sat beside him, leaving enough room for his leg, and changed the day’s record. Under PARTICIPANTS she entered both their names.
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